H28.REV

AIR DISTRIBUTION SYSTEM EQUIPMENT

NOTE: FINAL COPY: MAY, 1988.

Part 1 -	GENERAL

1)	WORK INCLUDED

A.	Work included in this Section includes the providing of labor, materials, equipment and services necessary for a complete and safe installation in accordance with the contract documents and all applicable codes and authorities having jurisdiction for the following

1.	Air distribution systems complete with diffusers registers, grilles, and accessories, terminal units, air pressure reducing valves, humidifiers and the installation of air boots for air handling type light fixtures

2)	RELATED WORK AND REQUIREMENTS

A.	Requirements of GENERAL CONDITIONS, DIVISION NO. 1 and Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK apply to all work in this Section

NOTE: EDIT TO SUIT PROJECT REQUIREMENTS. INCLUDE ONLY SECTIONS DIRECTLY AFFECTING WORK OF THIS SECTION

B.	Related work in the following sections:

1.	SHEET METAL WORK.

2.	AIR HANDLING SYSTEM EQUIPMENT.

3.	MECHANICAL VENTILATING SYSTEMS.

4.	VIBRATION ISOLATION.

5.	NOISE CONTROL.

6.	BALANCE AIR AND WATER SYSTEMS.

7.	-----------------------------

3)	REFERENCE STANDARDS

A.	Published Specifications' standards, test or recommended methods of trade, industry or governmental organizations apply to work in this Section

B.	Comply with all applicable national, state and local codes and refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK for additional Reference Standards

4)	QUALITY ASSURANCE

A.	Refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK for Guarantee and other Quality Assurance requirements

5)	SUBMITTALS

A.	Submit manufacturers' assurances that they have examined application of each outlet and guarantee that the outlets have been selected for and are capable of comfortable and draftless air diffusion, and are appropriate for the design intended

B.	Submit shop drawings for the following:

1.	Submit catalog cuts and Schedules of air diffusers, registers, grilles and accessories

a.	Each type, model number, size, service, blade setting angle and cfm

b.	Sound power levels at noted capacities, and room sound absorption rating based on NC values

c.	Throw and drop at noted capacities.

d.	Material of unit, finish and mounting details.

2.	Terminal units:

a.	Submit catalog cuts and Schedules of units, attenuators and heat transfer coils

(1)	Each unit size, service and model type with capacity performance including pressure drops

(2)	Sound power levels at noted capacities (air stream and radiated)

(3)	Length and thickness of soundlining downstream of each terminal unit to obtain noise criteria level

b.	Submit certification that sound lining meets requirements of UL Publication No. 181 and that the type, length and thickness comply with noise level criteria specified in Section "Noise Control"

c.	Submit wiring diagrams for electric reheat coils.

3.	Submit catalog cuts and Schedules of air pressure reducing valves

a.	Each size, service and model type with capacity performance including pressure drops

b.	Sound power levels at noted capacities (air stream and radiated)

c.	Length and thickness of soundlining to obtain noise criteria level

d.	Submit certification that sound lining meets requirements of UL Publication No. 181 and that type, length and thickness comply with noise level criteria specified in Section "NOISE CONTROL"

4.	Submit catalog cuts and Schedules of humidifiers:

a.	Each size, service, and type with capacity performance including radiated and convected heat to air stream

b.	Materials.

5.	Submit catalog cuts and Schedules of air boots:

a.	Information necessary for interfacing with air handling type light fixtures. Submit type of air pattern and volume control

b.	Performance rating with cfm, service, throw at rated capacity, sound power level, and pressure drop

Part 2 -	PRODUCTS

1)	BASE BID MANUFACTURERS

A.	Diffusers, registers and grilles: Agitair Div., Anemostat Products Div., Dynamics Corp. of America, Barb Aire Div., Titus Products Div., Philips Industries, Carnes Co. and Krueger Manufacturing Co

B.	Perforated laminar flow diffusers: Barb Aire Div., Titus Mfg. Div., Anemostat Products Div., Philips Inc. and Tuttle & Bailey Div., of Interpace Corp

C.	Terminal units: Buensod/Agitair Div., Anemostat Products Div., Dynamics Corp. of America, Barb Aire Div., The Trane Co., Carnes Co. and Titus Mfg. Div., Philips Industries

D.	Fan powered terminal units: Barb Aire Div., Anemostat Products Div., Dynamics Corp. of America and Titus Mfg. Div. Philips Industries

E.	Air pressure reducing valves: Buendsod/Agitair Div., Anemostat Products Div., Barb Aire Div., Dynamics Corp. of America, The Trane Co., Titus Mfg. Div., Philips Industries, Carnes Co. and American Warming and Ventilating Inc

F.	Humidifiers:

1.	Steam jet type: Armstrong Machine Works, Sarco Company and Dri-Steam Humidifier Company

2.	Pan type: Dri-Steam Humidifier Co. and Armstrong Machine Works

3.	Electric-steam boiler type: Carnes Corp., Armstrong Machine Works and Nortec Industries Inc

2)	AIR DIFFUSERS

NOTE: COORDINATE TYPE OF DIFFUSER AND TYPE OF CEILINGS WITH ARCHITECT

A.	Diffusers shall be with volume damper adjustable from diffuser face except as noted, without removal of face louvers or panel. Provide supply air diffusers with air-equalizing deflectors. Diffusers in same room shall be the same size and type, except as otherwise approved. Diffusers shall have removable core, unless otherwise noted. Supply plaster frames for diffusers without removable cores installed in plaster for setting under General Construction Work

1.	Provide diffusers suitable for the following ceiling construction, as required

a.	Metal pan ceilings shall have snap-in frame to match approved type ceiling suspension system

b.	Concealed spline type acoustical tile ceiling shall be flanged for surface mounting

c.	Lay-in acoustical tile ceiling with inverted tee-bar shall have lay-in type frame for setting on tee-bars

d.	Plaster ceilings shall be flanged for surface mounting, or plaster frames as indicated

2.	Noise level at noted capacities shall not exceed criteria specified in Section NOISE CONTROL. Diffusers shall be suitable for operation at 5 percent excess and 25 percent less than noted capacity. Provide blanking for proper coverage and blow without producing objectionable noise or air motion at occupied level. Finish shall match color sample as approved

NOTE: COORDINATE FINISH WITH ARCHITECT.

FINISH

a.	Baked enamel.

b.	Anodized.

c.	Duranodic.

d.	Aluminum lacquer.

FINISH

NOTE: FOR LOUVER-TYPE SQUARE OR RECTANGULAR DIFFUSERS SUITABLE FOR DIRECTIONAL BLOW

B.	Square and rectangular diffusers with removable core and air discharge shall be in one to four directions, as noted. Provide with minimum of 3 flaring removable members within each other

NOTE: FOR DIFFUSERS INSTALLED IN CONTINUOUS ROWS OF LIGHTING FIXTURES. COORDINATE WITH ELECTRICAL DEPARTMENT

1.	Diffusers shall be constructed to coordinate with lighting fixtures. Flanges shall be on 2 sides. Match lighting fixtures flanges for continuous frame around diffusers and fixtures. Coordinate with Electrical Work to insure perfect match of design, finish and alignment

NOTE: THE FOLLOWING DIFFUSERS HAVE A SQUARE OR RECTANGULAR FACE AND NECK. THEY ARE NOT TO BE USED ON VAV SYSTEMS BECAUSE OF THE POOR AIR DISTRIBUTION PATTERN AT REDUCED FLOW

TYPES

2.	Types: For exposed duct installation, diffusers shall be similar to Titus Type TDC-1

a.	For metal pan snap-in ceilings, diffusers shall be similar to Titus TDC-2

b.	For acoustical tile ceilings with exposed tee bars, diffusers shall be similar to Anemostat type DP, or Titus type TDC-3

c.	For acoustical tile ceilings with concealed splines, diffusers shall be similar to Titus type TDC-4

NOTE: THE FOLLOWING DIFFUSERS HAVE A 12 IN. X 12 IN. OR 24 IN. X 24 IN. FACE AND A ROUND NECK. THEY MAY BE USED ON VAV OR CONSTANT VOLUME SYSTEMS

3.	Types: For exposed duct installation, diffusers shall be similar to Titus type TMS-1

a.	For metal pan snap-in ceilings, diffusers shall be similar to Anemostat type E, or Titus type TMS-2

b.	For acoustical tile ceilings with exposed tee bars diffusers shall be similar to Anemostat type EPL, or Titus type TMS-3

c.	For acoustical tile ceilings with concealed splines diffusers shall be similar to Anemostat type E-1, or Titus type TMS-4

TYPES

NOTE: FOR CIRCULAR DIFFUSERS WHICH WILL PERMIT HORIZONTAL OR VERTICAL AIR DISCHARGE

CIRCUI

C.	Circular diffusers, adjustable pattern: Provide with minimum of 3 flaring, conical shaped members. At least 1 member shall be adjustable to permit horizontal or vertical air discharge. Diffusers shall be similar to Anemostat type C-27, Barb Aire Type VJ or Titus type TMRA

NOTE: FOR NONADJUSTABLE-TYPE DIFFUSERS, DISCUSS WITH DEPT CHIEF ENGINEER BEFORE USING

D.	Circular diffusers: Provide with minimum of 3 flaring, conical shaped members. Diffusers shall be similar to Anemostat Type CM-1, Barb Aire Type VF or Titus TM-1

CIRCUI

E.	Provide perforated diffusers:

SHAPE

1.	Square type.

2.	Square and rectangular.

SHAPE

3.	Supply air diffusers: with air pattern adjustment.

4.	Faceplates: with concealed hinges and catches. Exposed screws not permitted

5.	Types - Supply:

a.	Diffusers for surface mounting shall be similar to Barb Aire type PBS or PSS or Titus type PAS-1 or Aneomstat PRSO

b.	Diffusers for metal pan snap-in ceiling shall be similar to Barb Aire type PBR or Titus type PAS-2

c.	Diffusers for acoustic tile ceiling with exposed tee bars shall be similar to Barb Aire type PBL or PSL or Titus type PAS-3 or Anemostat PRCO

d.	For acoustic tile ceiling with concealed splines diffusers shall be similar to Barb Aire type PBP or PSP or Titus type PAS-4 or Anemostat PRCO

6.	Types - Return:

a.	Diffusers for surface mounting shall be similar to Barb Aire type PES or PAS or Titus type PAR-1 or Anemostat 3PRS

b.	Diffusers for metal pan snap-in ceiling shall be similar to Barb Aire type PES-R or PAS-R or Titus type PAR-2

c.	Diffusers for acoustic tile ceiling with exposed tee bars shall be similar to Barb Aire type PES-L or PAS-L or Titus type PAR-3 or Anemostat 3PRE

d.	Diffusers for acoustic tile ceiling with concealed splines shall be similar to Barb Aire type PES-P or PAS-P or Titus type PAR-4 or Anemostat 3PRC

NOTE: COORDINATE TYPE OF MOUNTING FRAMES AND IF PLASTER FRAMES, ARE REQUIRED WITH ARCHITECT

F.	Linear diffusers: Diffusers and frames shall be extruded aluminum. Frame types shall mate with ceilings. Provide means to neatly butt and align units to give continuous appearance without butting flanges. No screw holes or welded corners visible on diffusers or frames will be permitted. Air volume shall be adjustable through air supply face without requiring removal of face panel. Provide blanked sections for inactive lengths. Provide plaster frames and opposed blade volume dampers where noted. Refer to Architectural Drawings for mounting details and overall lengths. Finish shall match color sample as approved

NOTE: COORDINATE FINISH WITH ARCHITECT

COLOR

1.	Baked enamel.

2.	Anodized.

NOTE: FOR EXTERIOR GRADE. COORDINATE WITH ARCHITECT.

3.	Duranodic.

4.	Aluminum lacquer.

COLOR

5.	Continuous louver type: Surface mounted type similar to Titus type LL-1 or LL-2

6.	Continuous slot type: Slots with pattern and directional control blades, surface mounted type and similar to Barb Aire type CAA, Anemostat type SLADF or Titus type ML-2A

7.	Continuous narrow-slot type with opposed acting damper or directional vanes similar to Anemostat type TAL-1N or type TAL-1W or Titus Fineline types CT480 or CT580

8.	Combination terminal unit and slotted diffuser: Refer to Terminal Units

NOTE: PERFORATED PANEL DIFFUSERS FOR LAMINAR FLOW IN DRAFT FREE SPACES SUCH AS HOSPITAL OPERATING ROOMS., DELIVERY ROOMS, ANIMAL ROOMS AND SPECIAL LABORATORY ROOMS (COORDINATE WITH ARCHITECT)

G.	Perforated laminar flow diffusers:

1.	Diffuser shall be the non-aspirating modular type, surface mounted, square and rectangular as noted, perforated panel fastened to frame with approved type of fasteners, canopy plenum and round inlet supply air diffuser connections located at top of plenum. Mounting frame shall fit approved ceiling suspension system and conform to details on architectural drawings

2.	Panel swing out shall be secured with steel chain or braided wire and entire interior shall be accessible for inspection or cleaning

3.	Entire diffuser including perforated panel, frame, plenum and collar shall be anodized aluminum or steel or stainless steel. Steel panel finish shall be baked enamel of approved color

4.	Panel shall be suitable in minimum of 20 CFM per square ft of panel face area at 15 deg F temperature differential and maximum static pressure drop of.08 inch w.g

5.	Noise level at noted capacities shall not exceed criteria specified in Section NOISE CONTROL

6.	Diffusers shall be similar to Multi-Vent type MVART Unitary Panels as manufactured by Anemostat, Titus Model TLFH Perforated Hospital Diffuser, Tuttle & Bailey Model CRD Clean Room Diffuser, or Barb Aire Model PH

3)	REGISTERS AND GRILLES

A.	The manufacturer shall be responsible for examining the application of each outlet and shall guarantee that each outlet will provide comfort space conditions at noted capacity without drafts. Noise level at noted capacities shall not exceed criteria specified in Section NOISE CONTROL. Provide registers with key-operated, opposed-blade volume control. Refer to Architectural Drawings for mounting details. Finish shall match color sample as approved

NOTE: COORDINATE FINISH WITH ARCHITECT.

FINISH

1.	Prime coat.

2.	Baked enamel.

FINISH

3.	Supply plaster frames for grilles and registers without removable cores installed in plaster for setting under General Construction Work. Grilles and registers in aluminum ductwork or plenums shall be anodized aluminum. Grilles and registers in stainless steel ductwork or plenums shall be stainless steel

NOTE: REVIEW WITH MANUFACTURER.

4.	Curved registers or grilles: Provide registers, grilles and frames factory-fabricated to required radii

B.	Supply registers: Provide adjustable, double-deflection, formed bar type

BARS

1.	Face bars shall be vertical, 3/4 inch bar spacing.

2.	Face bars shall be horizontal, 3/4 inch bar spacing.

BARS

3.	Behind registers installed on side of duct, provide air-equalizing deflector, similar to Titus AG-25. Registers shall be similar to Titus Series 300RS5, Barb Aire type BEDD or Anemostat type X2VD

C.	Return and exhaust registers:

1.	Fixed curved or tilted blades between 30 and 45 deg for return high on wall or ceiling, 30 deg for returns below 4 ft and depth shall be 1 inch. Blades spacing shall be 3/4 inch and parallel to long dimension. Net effective free area shall be not less than 75 percent. Registers shall be similar to Titus Series 350RL5, Anemostat type S3HOD, or Barb Aire Model BDG

D.	Linear registers: Provide continuous multiple-bar design, extruded aluminum construction

DEFLE

1.	Deflection: 0 deg.

2.	Deflection: 15 deg.

3.	Deflection: 25 to 30 deg.

DEFLE

4.	For continuous runs provide extruded aluminum snap-in mounting frame and sections butted without breaks or flanges at joints. Provide blanked sections for inactive lengths. Refer to Architectural Drawings for mounting details and overall lengths

NOTE: COORDINATE FINISH WITH ARCHITECT.

5.	Finish shall match color sample as approved:

COLOR

a.	Baked enamel.

b.	Anodized.

c.	Duranodic.

d.	Aluminum lacquer.

NOTE: FOR REGISTERS IN ENCLOSURES PROVIDED UNDER GENERAL CONSTRUCTION WORK. ADVISE ARCHITECT TO PROVIDE SUITABLE REINFORCEMENT TO SUPPORT WEIGHT OF PEOPLE STANDING ON SILL OR FLOOR REGISTERS. COORDINATE DEFLECTION OF FACE

COLOR

6.	For registers in enclosures, coordinate registers with enclosure construction for proper fit and performance. Enclosures will be under General Construction Work. Register shall be similar to: Barb Aire TBA; Anemostat type AL1TN or AL15TN; or Titus type CT-1A

E.	Transfer grilles: As specified for return registers except omit volume control. Grilles shall be similar to Barb Aire BDG, Anemostat S3HO, or Titus series 350RL

F.	Lightproof transfer grilles: Fixed horizontal deflection, 3 bends and lightproof. Finish shall be dull-black lacquer or as approved. Grilles shall be similar to Tuttle & Bailey T980WL

4)	RETURN AIR SCREENS

A.	3/4 inch square pattern mesh, constructed of interwoven No. 16 galvanized wire and welded or secured to frame. Frame shall be 1 inch x 1 inch x 1/8 inch galvanized steel angles frames, continuous around perimeter of screen

5)	TERMINAL UNITS

A.	Casings shall be minimum No. 22 USSG steel, galvanized steel or 0.040 inch thick aluminum

LINING

B.	Acoustic lining shall be 3/4 inch thick neoprene coated 1-1/2 lb density fiberglass. Lining shall meet erosion test method described in UL Publication No. 181, and smoke developed and flame spread rating requirements of NFPA-90A. No cut edges of fiberglass shall be exposed to air stream

NOTE: FOR HOSPITALS USE HOSPITAL TYPE OF SOUND ATTENUATOR. FOR COST REDUCTION CONSIDER USING TEDLAR LINED UNITS ONLY IN H.E.W. "SENSITIVE AREAS" AS FOLLOWS. TEDLAR MUST BE APPROVED BY CHIEF ENGINEER

C.	Acoustic lining shall be 3/4 inch thick neoprene coated 1-1/2 density coated fiberglass with plastic sheathing similar to Dupont Tedlar encasing fiberglass to eliminate any air contact with the fiberglass. Fiberglass lining shall meet erosion test method described in UL Publication No. 181 and smoke developed and flame spread rating requirement of NFPA 90A

LINING

D.	Control motors shall be factory-installed on units by unit manufacturer. Motors shall be supplied by unit manufacturer or approved automatic control system manufacturer.

E.	Controllers shall be factory calibrated and preset for minimum and maximum air volumes noted. Air quantities shall be clearly indicated with pressure taps to permit field change of air quantities without special tools or replacement components. Units shall maintain pressure independence within plus or minus 5 percent, up to 6 inch w.g. inlet air pressure. Maximum static differential pressure 0.15 inch w.g. at inlet air velocity of 2000 fpm. Damper blades shall be aluminum set in self lubricating bearings. Leakage shall be 2 percent of maximum flow against 6 in. w.g. static pressure rated by Air Diffusion Council Standards. For units with reheat coils, regulators shall be sequenced with reheat controls

F.	Noise level at noted capacities shall not exceed criteria specified in Section NOISE CONTROL. Provide sound absorbers for units where noted or to conform with requirements of Section NOISE CONTROL. Units shall be tested in accordance with ASHRAE Standard 36-72 or ADC Code 1062R4, with ratings tabulated for upstream pressure of 4 inch w.g., 3 inch w.g. and minimum static pressure

NOTE: CHECK WITH CHIEF MECHANICAL ENGINEER.

1.	Noise level test results are subject to be checked in approved independent laboratory in accordance with approved test procedure. Cost of test will be paid by Owner, provided test proves units conform with noted criteria. Otherwise, cost of test and corrective work shall be borne by manufacturer

G.	Depth of units shall not exceed allowable space allocation. Moving parts shall be suitable for minimum of 300,000 cycles. Units shall be in compliance with U.L. 181 and NFPA 90A

H.	Variable air volume or constant volume units: Units shall be pressure independent and capable of N.O., N.C., direct action, or reverse acting as required to meet control requirements. Maximum pressure drop shall not exceed 0.4 inch w.g. pressure differential across terminal

NOTE: COORDINATE WITH OTHER SECTIONS.

COIL

1.	Hot water reheat coils: Refer to Section AIR HANDLING EQUIPMENT. Provide factory mounted access planel for coil inspection and cleaning.

2.	Electric reheat coil: Refer to Section ELECTRIC HEATING. Provide factory mounted access panel for coil inspection and cleaning

COIL

3.	Units shall be similar to Titus Series ESV-3000.

I.	Dual-duct mixing units complete with control motors, constant volume controller and air-mixing chamber shall maintain maximum leakage 5 percent of nominal unit capacity at 6 inches w.g. inlet static pressure. Units shall be similar to Titus serie EDV 3000

J.	Fan powered recirculating fan units:

NOTE: VOLUME DAMPERS SHOULD BE INSTALLED DOWNSTREAM OF EACH UNIT FOR BALANCING

1.	VAV primary air and constant volume total air, pressure independent unit and low inlet pressure, with direct drive fan in unit casing, motor with overload protection, and integral controls. Supply one replacement motor for every 20 units installed. Units shall be similar to Barb Aire model HCP or Titus Model EFC

NOTE: THE CONTROLS FOR THE FOLLOWING UNIT ARE SYSTEM POWERED. UNIT CAN BE USED FOR VAV OR CONSTANT VOLUME APPLICATIONS

6)	MODULAR TERMINAL UNIT WITH INTEGRAL SLOTTED DIFFUSER

A.	Plenum: unit plenum shall be constructed of a minimum 24 gauge thick galvanized steel, prime-coated or 22 gauge thick aluminum with suitable 6 inch diameter round inlet connection and acoustic lining. Acoustic linings shall be 1-1/2 inch thick coated fibrous glass. Lining shall meet erosion test method described in UL Publication No. 181. Length of Plenum shall be suitable for installation in ceiling grid. Refer to Architectural details.

B.	Control System: Self contained control system, consisting of a thermostat and volume regulator self powered from air duct system pressure shall be provided by unit manufacturer. Unit shall be complete with a plug-in filter for filtering system factory calibrated. Air before reaching the control unit. Adjustable thermostat operating range shall be 65 deg F to 86 deg F with throttling range plus or minus 1 deg F

C.	Constant-volume limiting device shall be factory calibrated. Air quantities shall be clearly indicated. Complete with calibrated dial adjustment to permit field change of air quantities. Device shall be capable of maintaining constant volume, plus or minus 5 percent, up to 5 inch w.g. inlet air pressure.

D.	Diffuser section shall be constructed of aluminum with two 3/4 inch slots. Finish shall match color sample as approved

NOTE: COORDINATE FINISH WITH ARCHITECT.

COLOR

1.	Baked enamel.

2.	Anodized.

COLOR

E.	Noise level at noted capacities shall not exceed criteria specified in Section NOISE CONTROL. Depth of units shall not exceed allowable space allocation. Moving parts shall be suitable for minimum of 300,000 cycles. Units shall be similar to Carrier Moduline model 37; or Trane Co. Model VDLC

NOTE: NOT TO BE USED AS AIR REGULATOR.

7)	AIR PRESSURE REDUCING VALVES

MANU

A.	Valves shall be manually operated.

B.	Valves shall be motor-operated.

MANU

C.	Valves shall be complete with adjustable aluminum air foil blades with self lubricating gears, with all linkage located outside of air stream. Housing shall be aluminum and flanged

NOTE: FOR MOTOR-OPERATED VALVES. OMIT IF NOT NEEDED.

1.	Motor platform shall be bolted to housing and field-reversible to upstream or downstream side of valves. Provide with adjustable linkage

2.	Leakage shall not exceed 10 cfm per sq ft at 4 inch diff. pressure with maximum torque of 210 lbs. applied to damper shaft. Depth of unit shall not exceed allowable space allocations. Noise level at noted capacities shall not exceed criteria specified in Section "Noise Control". All units shall be rated by AMCA Std. 500. Units shall be similar to Titus Model AG-606

NOTE: SPECIFY TYPE DESIRED.

8)	HUMIDIFIERS

UMID

A.	Steam injection type shall be stainless steel, centrifugal type, steam-water separator, with silencer, normally closed modulating type steam valve, pneumatic or electric operator, preset minimum temperature switch, steam traps, steam strainer, piping indicated, escutcheons and accessories as required. Factory assembled multi-tube distribution manifold shall have insulated stainless steel dispersion tubes with stainless steel insulation jacket and interchangeable proportional machined brass orifice inserts. Humidifiers shall be similar to Dri-steam Humidifier Company with pneumatic temperature switch or electric temperature switch to prevent automatic valve from opening until return line reaches preset temperature

B.	Electric evaporative pan type: Evaporating chamber shall be constructed of 14 gauge type 304 stainless steel with welded joints and gasketed cover plate and clean out access plate. Electric resistance heater shall be rated at 80 watts/sq inch, with stainless steel clad threaded into face of humidifier. Brass body water make-up valve solenoid shall be operated and complete with cleanable strainer. Steel steam dispersion tubes shall be stainless steel with press fit interchangeable machined brass orifice inserts and necessary connecting steam hose, clamps and escutcheons. Three stainless steel conductivity probes with teflon coating for low water protection and water level control shall be mounted in face of humidifier. Field adjustable, stainless steel surface skimmer shall maintain continuous mineral removal. Factory or field mounted control panel shall be welded 14 ga. steel with hinged gasketed cover containing magnetic contactors, fused control circuit transformer, numbered terminal strip, fuses for heater circuits and solid state control system module. Humidifiers shall be factory installed in factory fabricated air handling unit. Humidifier shall be complete with automatic make-up water solenoid valve prewired to terminal box, brass fittings, overflow connection piped to suitable drain, low water cut-off switch and local alarm prewired to terminal box. Humidifiers shall be similar to Vaporstream Model VPC as manufactured by Dri-Steam Humidifier Company

UMID

C.	Electric steam boiler type: Self-contained, factory packaged electric steam generating unit, UL approved and prewired. Humidifier shall be suitable for domestic water. The individual replaceable steam generating units shall be low pressure complete with electrodes, distributing brass manifold, condensate drain piping, integral corrosion resistant cabinet with controls, pressure reducing valve, filter cartridge and solenoid valves. Humidifier with boiler shall be similar to Lumatic Humidification Unit as manufactured by Carnes Co

Part 3 -	EXECUTION

1)	INSTALLATION

A.	Return and exhaust registers: For wall installations, mount on upper portion of wall with upward deflection. Mount on lower portion of wall with downward deflection

B.	Transfer grilles: For wall installations, provide 2 grilles, 1 on each side of wall, with connecting sheet metal collar. For transfer ducts, provide 2 grilles, 1 at each end of duct

C.	Return air screens: Mount at terminations of return air ducts in hung ceilings. Provide flanged connections in ceiling return air ducts at terminations. Bolt screens to flanged connections

D.	Terminal units: Provide soundlinings downstream of units with lengths as noted or recommended by unit manufacturer (whichever is greater) to conform with noise-criteria levels specified in Section NOISE CONTROL. Provide sound traps where noted. For soundlinings, provide types as specified in Section NOISE CONTROL

E.	Air valves in ducts: Provide soundlining downstream of units with lengths as noted or recommended by unit manufacturer (whichever is greater) to conform with noise-criteria levels specified in Section NOISE CONTROL. For soundlinings, provide type as specified in Section NOISE CONTROL

NOTE: COORDINATE WITH CHIEF ENGINEER AND COORDINATE WITH SECTION NOISE CONTROL.

F.	For hospital provide hospital approved sound alternator downstream of terminal units and air valves

G.	Air handling type lighting fixtures: Recessed fluorescent air handling type lighting fixtures are provided under Electrical Section of the Specifications. Under this Section, perform the following

NOTE: COORDINATE WITH ELECTRICAL DEPARTMENT.

1.	Receive all boots and plenums at job site.

2.	Install, connect and balance all air boots as indicated

3.	Remove supply air slot covering strip before mounting air boot to lighting fixture

4.	Supply and install flexible duct connections from branch duct to fixture boot

5.	Balance and adjust slot air pattern with directional control blades

H.	Evaporative pan type humidifiers: Provide domestic water make up piping from valved outlet provided under Plumbing Work. Provide drain piping from units to floor drain or slop sink. Coordinate with Electrical Work

I.	Electric steam boiler humidifiers: Provide domestic water make up piping from valved outlet provided under Plumbing Work. Provide condensate drain piping from units to floor drain or service sink. Coordinate with Electrical Work