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READ AND REMOVE THIS PAGE BEFORE PLACING
THE SPECIFICATION SECTION IN THE CONTRACT

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DIVISION 15:  MECHANICAL

SECTION 15940 ‑ AIR OUTLETS AND INLETS

USE:	Furnishing and installing ceiling diffusers and return air grilles for the HVAC Systems.  

NOTES TO SPECIFIER:

	A.	Options within paragraphs are identified by enclosure in brackets; blank spaces enclosed by brackets [_____] provide for information to be inserted, as appropriate, to individual projects.

	B.	TO AVOID CONFLICTING REQUIREMENTS AND COSTLY MISTAKES, the specifier must edit (delete, substitute or add to the text).  The remaining paragraphs must be renumbered.

	C.	DELETE FOR FINAL COPY: Notes to the Specifier, located between lines of asterisks; all [brackets], underlining, boldface, and italics, within the paragraphs; and this page.  (Open Reveal Codes [alt F3] to do this accurately.)

	D.	To Edit “(Footer B)”: (Corel 8).  ENTIRE FOOTER SHOULD BE BOLDED.  Click in the footer and delete the “Project Name (ftr B)” text and replace it with the Name of the Project (upper and lower case).  Replace date with current MM/YY (WITHOUT BRACKETS).

	E.	The Guide Specifications are intended to be continuously reviewed and revised.  User’s technical comments are appreciated.  Also, other related or similar specification that are written “from scratch” that could benefit others, or other questions can be sent to NSTC A/E Group, ST 110, or call (303) 987-6868.

DRAWING DATA REQUIRED:

REQUIRED SPEC MODIFICATIONS:

GENERAL NOTES

A.	Whenever entire articles, paragraphs or subparagraphs are not applicable, the articles, paragraphs or subparagraphs should be deleted; when necessary, reletter or renumber articles, paragraphs or subparagraphs.

B.	THIS GUIDE IS NOT INTENDED AS A SUBSTITUTE FOR READING THE ENTIRE SECTION.

TECHNICAL NOTES

A.	1.1A:  Select applicable words.

B.	1.1B:  Select or add applicable specification sections.  Do not list specification sections from Division 15.

C.	1.2:  Select or add applicable references.

D.	1.3B:  Insert number of copies of the manufacturer's descriptive data required.  Normally 5 copies are required.  Distribution after review is normally 1 copy to the COR, 3 copies to the Contractor, and 1 copy to the project file.

E.	1.3C:  Insert number of copies of the manufacturer's installation instructions required.  Normally 5 copies are required.  Distribution after review is normally 1 copy to the COR, 3 copies to the Contractor, and 1 copy to the project file.

F.	1.3C:  Select applicable words.

G.	1.3D:  Insert number of copies of the manufacturer's operation and maintenance instructions required.  Normally 5 copies are required.  Distribution after review is normally 1 copy to the COR, 3 copies to the Contractor, and 1 copy to the project file.

H.	1.3D:  Select applicable words.

I.	1.3E:  Insert number of copies of the equipments performance data required.  Normally 5 copies are required.  Distribution after review is normally 1 copy to the COR, 3 copies to the Contractor, and 1 copy to the project file.

J.	1.3E:  Select applicable words.

K.	1.3F:  Insert number of copies of shop drawings required.  Normally 5 copies are required.  Distribution after review is normally 1 copy to the COR, 3 copies to the Contractor, and 1 copy to the project file.

L.	ab1.3F:  Select applicable words.

M.	1.3G:  Insert number of copies of the reports required.  Normally 5 copies are required.  Distribution after review is normally 1 copy to the COR, 3 copies to the Contractor, and 1 copy to the project file.

N.	ab1.3G:   Select applicable words.

O.	2.1A1:  Select applicable words.

P.	2.1B1:  Select face type and deflection or style.

Q.	2.1B2:  Insert required dimension.

R.	2.1B3:  Insert required gauge.

S.	2.1B5:  Select finish required.

T.	2.1C1:  Select deflection requirements.

U.	2.1C2:  Insert required dimension.

V.	2.1C5:  Select and insert applicable information.

W. 	2.1D1:  Select blade requirements.

X.	2.1D3:  Select phrase when applicable.

Y.	2.1D4:  Select applicable phrase.

Z.	2.1D5:  Insert type of floor or wall.

	AA.	2.1F1:  Insert dimensions of louver.

	AB.	2.1F2:  Select applicable phrase.

	AC.	2.1F3:  Select applicable metal.

	AD.	2.1G1:  Select applicable information.

	AE.	2.1G2:  Insert required dimension and select phrase when applicable.

	AF.	2.1G3:  Select applicable words.

	AG.	2.1G5:  Select applicable words.

	AH.	2.1H2:  Select phrase when applicable.

	AI.	2.1H4:  Select applicable words.

	AJ.	2.1I1:  Select pattern desired.

	AK.	2.1I2:  Select applicable frame type.

	AL.	2.1I3:  Insert type of construction material and select finish.

	AM.	2.1I4:  Select applicable words.

	AN.	2.1J2:  Select applicable phrase.

	AO.	2.1J3:  Select applicable words.

	AP.	2.1J4:  Select applicable words.

	AQ.	2.1K1:  Select applicable words.

	AR.	2.1K3:  Select applicable words.

	AS.	2.1L1:  Insert gauge of steel, and dimensions required.

	AT.	2.1L2:  Insert gauge of steel required.

	AU.	2.1M1:  Select applicable words.

	AV.	2.1M2:  Select applicable material.

	AW.	2.1M3:  Select finish.

	AX.	2.1N1:  Insert dimensions required.

	AY.	2.1N2:  Insert gauge of metal required.

	AZ.	2.1N3:  Insert dimension.

	BA.	2.1N4:  Select finish.

	BB.	2.1N5:  Insert minimum area.

	BC.	2.1O1:  Insert gauge required.

	BD.	2.2A:   Select applicable word.

	BE.  3.2B:	  Select applicable word.

	BF.	3.3:    Complete or delete as applicable.

	BG.  3.3A:   Select applicable words.

	BH.	4.1 and 4.2:  When a "lump sum" Contract is used, delete the title PART 4:  MEASUREMENT AND PAYMENT, and both articles from this section.  Measurement and payment will be addressed in Part 4 of Section 01010 -Summary of Work.

REVISIONS OF THIS SECTION:
CSI format, editorial changes: 12/01
Metric:  
Technical Update: 12/90

SECTION 15940

AIR OUTLETS AND INLETS

PART 1:  GENERAL

1.1  SUMMARY:

	A.	Section Includes:  [Furnishing] [and] [installing] [diffusers,] [grilles and registers,] [outside louvers,] [door grilles,] [roof hoods,] [and] [goosenecks] for heating, ventilating and air conditioning systems.

1.2  REFERENCES:

	A.  Air Diffusion Council:
	ADC 1062R4‑77		Air Diffusing Equipment Certification, Rating and Test Manual

	B.  Air Conditioning and Refrigeration Institute:
	ARI 880-89		Air Terminals   

	C.  National Fire Protection Association:
	NFPA 90A‑89		Installation of Air Conditioning and Ventilating Systems 

1.3  SUBMITTALS:

	A.  General:  Submittals shall be according to Section 01300 ‑ Submittals.

	B.	Manufacturer's Literature:  Submit [    ] copies of the manufacturer's descriptive data for the diffusers, grilles, and registers to be used on this project.

	C.	Installation Instructions:  Submit [    ] copies of the manufacturer's installation instructions for the [diffusers,] [grilles], [and] [registers] to be used on this project.

	D.	Operation and Maintenance Instructions:  Submit [    ] copies of the manufacturer's operation and maintenance instructions for the [diffusers,] [grilles,] [and] [registers] to be used on this project.

	E.	Performance Data:  Submit [    ] copies of the manufacturer's performance characteristics and sound ratings of the [grilles], [registers], [and] [diffusers] to be used on this project.

	F.	Shop Drawings:  Submit [    ] copies of shop drawings for the [diffusers], [grilles], [and] [registers] to be used on this project.  A bill of materials shall be furnished with the shop drawings.

G.	Reports:  Submit [    ] copies of the recommended method of measuring airflows and the free area of the [grilles], [registers], and [diffusers] to be used in this project.

1.4  QUALITY ASSURANCE:

	A.	Certification Requirements:  Outlets and inlets shall be certified according to ARI 650.   Unit ratings shall be certified according to ADC 1062R4.

	B.	Testing Requirements:  Units shall be tested according to ADC 1062R4.
PART 2:  PRODUCTS

2.1  MATERIALS:

	A.  General:

		1.	The [ceiling,] [wall,] [diffusers,] [floor supply registers,] and return air grilles shall be factory fabricated of [steel] [aluminum] and factory prime coated or finished as shown on the drawings.

		2.  Provide supply outlets with sponge rubber seal around edge.

		3.  Provide plaster frame for diffusers located in plaster surfaces.

		4.	Provide anti‑smudge frames or plaques on diffusers located in rough textured surfaces such as an acoustical plaster.

	B.  Supply Grilles:

		1.	For Sidewall Supply Grilles provide streamlined and individually adjustable blades, depth of which exceeds 3/4‑inch maximum spacing.  Provide spring tension or other device to set blades.  Provide units with [vertical] [horizontal] face, [single] [double] deflection bar style grilles.

		2.	Provide [[    ]‑inch] margin frame with countersunk screw holes.

		3.	Fabricate of steel with [20‑gauge] minimum frames and [22‑gauge] minimum blades, steel and aluminum with 20‑gauge minimum frame, or aluminum extrusions.

		4.	Provide grilles with integral, gang‑operated opposed blade dampers with removable key operator, operable from face.

		5.	Finish in factory [baked enamel] [prime coat] finish.

	C.  Ceiling Supply Grilles:

		1.	For ceiling supply grilles provide streamlined and individually adjustable curved blades to discharge air along face of grille.  Units shall have [one‑way] [two‑way] [three-way] [four-way] deflection.

		2.	Provide [[    ]‑inch] margin frame with countersunk screw holes.

		3.  Fabricate of aluminum extrusions.

		4.	Provide grilles with integral, gang‑operated opposed blade dampers with removable key operator, operable from face.

		5.	Finish in factory [clear lacquer] [prime coat] [                 ] finish.

	D.  Linear Supply Grilles:

		1.	Linear supply grilles shall have streamlined blades with [0 degree] [15 degree] deflection, 1/8 x 3/4‑inch on [1/4‑inch] [1/2‑inch] centers.

		2.	Fabricate of aluminum extrusions.
		3.	Provide 1-1/4‑inch margin frame [extra heavy for floor mounting,] with countersunk screw holes.

		4.	Provide grilles with integral [gang‑operated opposed blade] [hinged single blade] damper with removable key operator, operable from face.

		5.	Provide mounting frame suitable for casting in [         ] [floor] [wall].

	E.  Floor Supply Grilles:

		1.	Floor grilles shall have individually adjustable blades, wide stamped border, single or double blade damper with set screw adjustment.

  	2.	Fabricate of steel, welded construction.

		3.	Finish in factory baked enamel finish.

	F.  Grid Core Return and Exhaust Grilles:

		1.	Fabricate fixed grilles of [1/2]‑inch x [1/2]‑inch x [1/2]‑inch louvers.

		2.	Provide [1-1/4‑inch margin frame with countersunk screw holes.]  [lay‑in frame for suspended grid ceilings.]

		3.	Fabricate of [aluminum.] [steel.]

		4.	Provide exhaust grilles, where not individually connected to exhaust fans, with integral, gang‑operated opposed blade dampers with removable key operator, operable from face.

	G.  Linear Return or Exhaust Grilles:

		1.	Linear return or exhaust grilles shall have streamlined blades with [0 degree] [15 degree] deflection, 1/8 x 3/4‑inch on [1/4‑inch] [1/2‑inch] centers.

		2.	Provide [     ] margin frame [extra heavy for floor mounting,] with countersunk screw holes.

   	3.	Fabricate of steel with [20‑gauge minimum frames and 22‑gauge minimum blades,] [steel and aluminum with 20‑gauge minimum frame,] [aluminum extrusions].

		4.	Provide exhaust grilles, where not individually connected to exhaust fans, with integral, gang‑operated opposed blade dampers with removable key operator, operable from face.

		5.	Provide mounting frame for [casting in concrete floor.]  [wall].

	H.  Round Supply Diffuser:

		1.	Provide round, adjustable pattern, stamped or spun, multicore type diffuser to discharge air in 360 degree pattern, with sectorizing baffles.

		2.	Project diffuser collar [not more than 1 inch] above ceiling face and connect to duct with duct ring.
		3.	Fabricate of steel with baked enamel finish.

		4.	Provide [radial opposed blade] [butterfly] [combination splitter] damper and multi-louvered equalizing grid with damper adjustable from diffuser face.

	I.  Rectangular Supply Diffuser:

		1.	Provide rectangular, adjustable pattern, stamped, multi-core type diffuser to discharge air in [1] [2] [3] [4] ‑way pattern with sectorizing baffles where indicated or required.

		2.	Diffusers shall have [surface mount] [snap‑in] [inverted T‑bar] [spline] type frame.

		3.  Fabricate of [     ] with baked enamel [off‑white] finish.

		4.	Provide positive action damper control lever, individually adjustable verticle facebars and multi-operated horizontal louvers.

		5.	Provide [radial opposed blade] [butterfly] [combination splitter] damper and multilouvered equalizing grid with damper adjustable from diffuser face.

	J.  Perforated Face Diffuser:

		1.	Provide perforated face diffuser with fully adjustable pattern and removable face.

		2.	Provide [surface mount] [snap‑in] [inverted T‑bar] [spline] type frame.

		3.	Fabricate perforated plate of steel with [steel] [extruded] [aluminum] frame and baked enamel [off white] finish.

		4.	Provide [radial‑opposed blade] [opposed blade] [butterfly] [combination splitter] damper and multilouvered equalizing grid with damper adjustable from diffuser face.

	K.  Modified Light Troffer Diffusers:

		1.	Light troffer diffusers shall be [single] [double] plenum type constructed independent of light troffers with volume and pattern controllers, [4‑inch] [5‑inch] [6‑inch] round or oval [top] [side] air inlet.  Refer to Section 16510 ‑ Interior Luminaries to coordinate placement of diffusers with respect to lighting requirements.

		2.	Match diffusers to troffers and connect in air‑tight connection without tools.

		3.	Fabricate of galvanized steel with [welded] [soldered] joints and finish [matt black] inside.

	L.  Door Grilles:

		1.	Fabricate of V‑shaped louvers of [[    ]‑gauge] steel, [[    ]-inch] deep on [[    ]‑inch] centers.

		2.	Provide [[    ]‑gauge] steel frame with auxiliary frame to give finished appearance on both sides of door.

		3.	Factory prime coat finish.

	M.  Outside Louvers:

		1.	Louvers [4‑inch] [6‑inch] deep with blades on [30] [45] degree slope [with center baffle and return bend] heavy channel frame, birdscreen with [1/2‑inch] square mesh for exhaust and [3/4‑inch] for intake.

		2.	Fabricate of [16‑gauge] galvanized steel] [12‑gauge extruded aluminum] and provide welded assembly.

		3.	Finish in factory [prime coat] [baked enamel] [color anodized] finish.

		4.	Fabricate louvered penthouses with mitered corners and reinforced with structural angles.

N.  Roof Hoods:

		1.	For air inlet or exhaust hoods provide removable hood, curb flange and birdscreen with [[    ]‑inch] square mesh for exhaust and [[    ]‑inch] for intake.

		2.	Fabricate of galvanized steel, minimum [[    ]‑gauge] base and
[[    ]‑gauge] hood or aluminum minimum [[    ]‑gauge] base and
[[    ]‑gauge] hood.  Provide suitable reinforcing to hood.

		3.	Mount unit on minimum [12‑inch] high curb base with insulation between duct and curb.

		4.	Finish in factory [prime coat] [baked enamel] finish.

		5.  Make hood outlet area minimum of [twice] the throat area.

	O.  Goosenecks:

		1.	Fabricate goosenecks of minimum [18]‑gauge galvanized steel.

		2.	Fabricate or install prefabricated roof curb of size and type to conform with gooseneck.

2.2  CAPACITIES:

	A.	Air Flow:  The air flow capacity, sound levels, and pressure drops of each [grille], [register], [and] [diffuser] shall be as shown on the [drawings] [schedule].

PART 3:  EXECUTION

3.1  EXAMINATION:

	A.  Verification of Conditions:

		1.	Review requirements of outlets as to size, finish, and type of mounting prior to submitting shop drawings and schedule of outlets.

		2.	Check location of outlets and make necessary adjustments in position to conform with architectural features, symmetry, and lighting arrangements.

3.2  INSTALLATION:

	A.	General:  Install items according to the manufacturer's printed instructions and NFPA 90A.

	B.	Mounting Frames:  Provide suitable mounting frames for [grilles], [registers], [and] [diffusers.]

	C.	Attachment:  Frames shall be secured to surfaces by means of screws or other method as recommended by the manufacturer, or as shown on the drawings.

	D.	Finish:  Paint ductwork, visible behind air outlets, matt black.

	E.	Location:  Install outlets and inlets at locations as shown on the drawings.

	F.	Equalizing Devices:  Where possible, there should be a straight duct length of 2‑1/2 duct diameters before attachment to diffusers.  Where this is not feasible and where the duct elbow has a centerline radius less than 1‑1/2 times the width of the duct in the plane of the turn, an equalizing device shall be used to provide uniform airflow in the diffuser collar.

3.3  SCHEDULES:

	A.	Requirements:  [Diffuser] [and] [Grille] [and] [Register] Schedule:  Listed below is a schedule of the air flow capacity, sound levels, and pressure drops of each [diffuser] [grille], [and] [register]: 

ITEM      TYPE      CFM       THROW       PRESS DROP     NC      NECK DIA

PART 4:  MEASUREMENT AND PAYMENT

4.1  METHOD OF MEASUREMENT:

	A.	Units:  The work described in this section will not be measured for payment.

4.2  BASIS OF PAYMENT:

	A.	Payment:  No direct payment for the work described under this section will be made.  The Contractor shall include consideration for this item in the bid price for other items of the Contract.

END OF SECTION