Mechanical · M-J3ER4

Ceiling Return Grille and Air Plenum Boot

Materials

Aluminum Metal (misc.)

Elements

Walls Ceilings Floors / Slabs Insulation Connections / Plates

Connections

Bolted Connection

About this detail

A ceiling return grille connects to an air plenum boot with flexible ductwork and sound boots. The assembly is secured to the structure above using hanger straps and safety wires sized according to weight requirements. Piping runs with insulation and aluminum jackets are mounted on Dura-Blok base supports with strut clamps, lag bolts, and isolation washer bushings. Louver ducts and plenum boxes are coordinated with exterior walls per architectural plans.

LOUVER DUCT. SEE FLOOR PLANS FOR SIZE. PLENUM BOX EXTERIOR WALL (SEE NOTE #1) NOTES: 1. SEE ARCHITECTURAL FLOOR PLANS AND SPECIFICATION FOR LOUVER SIZE AND MATERIAL 2. CONNECTION TO BOTTOM OR TOP OF PLENUM BOX SIMILAR 12" MIN 1 2 3 4 1 2 3 15° MIN 2 INTERIOR EXTERIOR SECTION PLAN 4 1 3 2 PIPING WITH INSULATION ALUMINUM JACKET. SEE PLANS FOR SIZES. 4 5 6 7 8 2"ø MAX @220# (BOTH PIPES) PER 8' STRUT CLAMPS 1/2" LAG BOLT INTO SLEEPER TYPE HG BOLT ISOLATION WASHER BUSHING SUPER WM WAFFLE PAD MOUNT SHEET METAL CAP 2 1 (TYP) 3 (TYP) 4 (TYP) 5 6 (TYP) 7 8 DURA-BLOK BASE SUPPORT BY COOPER INDUSTRIES OR EQUIVALENT. BASE SUPPORT TO BE SET IN MASTIC. 1 NOTE: 1. IF GRILLE IS LESS THAN OR EQUAL TO 56 LBS, PROVIDE TWO #12 GAGE SLACK SAFETY WIRES AT DIAGONAL CORNERS. IF DIFFUSER IS MORE THAN 56 LBS, PROVIDE INDEPENDENT SUPPORT USING 4 TAUT #12 GAGE WIRES, ONE AT EACH CORNER, ATTACHED TO STRUCTURE ABOVE 2. SEE STRUCTURAL DETAIL 1/S9.02 FOR UPPER ATTACHMENT DETAIL. 3. BOOT DIMENSION SHALL BE EQUAL TO THE TRANSFER AIR GRILLE. BOOT HEIGHT SHALL BE EQUAL TO 12". 4. SEE DUCT INSULATION SCHEDULE ON M-B0.20 FOR MATERIAL AND THICKNESS REQUIREMENTS. 5. PULL BACK JACKET & INSULATION FROM CORE DUCT COLLECT EXCESS INNER DUCT PAST COLLAR BEAD UNTIL FULLY STRETCHED, THEN WRAP AT LEAST TWICE AROUND WITH APPROVED TAPE AND SECURE WITH APPROVED CLAMP. PULL JACKET & INSULATION BACK OVER THE CORE. SECURE JACKET WITH TWO WRAPS OF TAPE OR AN APPROVED CLAMP. TUCK IN EDGE OF JACKET OR TAPE. FIBERS SHALL NOT BE EXPOSED. CEILING GRILLE. PROVIDE ROUND TO RECT NECK ADAPTOR CEILING HANGER STRAP SECURE TO STRUCTURE ABOVE (SEE NOTE #2) INTERNALLY LINED SHEET METAL SOUND BOOT (SEE NOTES #3 & #4) 2 3 4 RETURN BOOT 6" 5 5 2 4 WIRED MESH SCREEN AT TERMINATION 6 6 6 2 1 8 10 7 3 4" WIDE SHEET METAL STRAP 7 DUCT COLLAR (SEE NOTE #4) 8 FLEX DUCT 9 SECURE WIRE TO STRUCTURE ABOVE (SEE NOTE #2) 10 9 1" 20 GAGE DUCT STRAP ONE PER SIDE (4 TOTAL). ATTACH TO GRID WITH 2 #8 SM SCREWS. PROVIDE RUBBER WASHER WHEN TAPPING INTO AIR TERMINAL DEVICE. 11 11 N.T.S. 06 CEILING RETURN GRILLE & AIR PLENUM BOOT

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