NOTE: Use this paragraph for Navy projects only.
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Provide adjustable [one-way,] [two-way,] [three-way,] [or] [four-way] air
pattern controls as indicated. Diffuser faceplates shall not sag or
deflect when operating under design conditions.
2.6.5.3
Linear Diffusers
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NOTE: Use this paragraph for Navy projects only.
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Joints between diffuser sections shall appear as hairline cracks. Provide
alignment slots for insertion of key strips or other concealed means to
align exposed butt edges of diffusers. [Equip with plaster frames when
mounted in plaster ceiling.] Do not use screws and bolts in exposed face
of frames or flanges. Frames and flanges exposed below ceiling shall be
metal-filled and ground smooth. Furnish separate pivoted or hinged
adjustable air-volume-damper and separate air-deflection blades.
2.6.5.4
Security Ceiling Diffusers
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NOTE: Use this paragraph for brig facilities only.
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Diffusers shall be steel with faceplate, fixed diffusion louvers, flat
surface margin, and an opposed blade damper. Faceplate shall be 14 gage
minimum with 15 by 15 mm holes on 5 mm 1/2 by 1/2 inch holes on 3/16 inch
spacing and a minimum free area of 45 percent.
2.6.5.5
Registers and Grilles
Units shall be four-way directional-control type, except that return and
exhaust registers may be fixed horizontal or vertical louver type similar
in appearance to the supply register face. Furnish registers with
sponge-rubber gasket between flanges and wall or ceiling. Install wall
supply registers at least 150 mm 6 inches below the ceiling unless
otherwise indicated. locate return and exhaust registers 150 mm 6 inches
above the floor unless otherwise indicated. Four-way directional control
may be achieved by a grille face which can be rotated in 4 positions or by
adjustment of horizontal and vertical vanes. Grilles shall be as specified
for registers, without volume control damper.
2.6.5.6
Registers
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NOTE: Use this paragraph for Navy projects only.
Delete paragraph, "Registers and Grilles," when this
paragraph is used.
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Double-deflection supply registers. [Provide manufacturer-furnished volume
dampers. Volume dampers shall be of the group-operated, opposed-blade type
and key adjustable by inserting key through face of register. Operating
mechanism shall not project through any part of the register face.
Automatic volume control devices will be acceptable.] [Provide exhaust and
return registers as specified for supply registers, except that exhaust and
SECTION 15895
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