ALTERNATIVE SUPPORT SUPPORT TO RISER REINFORCEMEN REINFORCEMENT T ABOVE AB OVE FLOO FLOOR R
HANGER ROD BETWEEN RISER SUPPORT & RISER REINFORCIN REINFORCING G
RISER REINFORCING (FOR DUAL DUTY) FASTENERS * FIG. B * MINIMUM NUMBER OF FASTENERS ON EACH OF TWO SUPPORT BARS LARGEST DU DUCT DI DIM.
M INIM UM NU NUMBER OF FASTENE FASTENERS RS
16” and down 17” - 24” over 24”
2 3 Largest duct dim. Divided by 8
Locate a fastener within 2” of of the duct edges. Locate others at evenly spaced intervals. See Table Table 4-4 on page 4.16.
SUGGESTED SIZING FOR SUPPORT OF 12 FT. OF DUCT
DUCT JOINT
2”
ANGLE
DUCT SIZE
ANGLE
36” x 18”
1 1/2” x 1 1/2” x 1/8”
48” x 24”
1 1/2” x 1 1/2” x 1/8”
60” x 30”
1 1/2” x 1 1/2” x 3/16”
60” x 60”
1 1/2” x 1 1/2” x 1/4” or 2” x 2” x 1/8”
FIG. A
3” MAX. OVER 60” - INCREASE ANGLE SIZE AS DISTANCE REQUIRED FOR SPACE & DUCT SIZE TO SUPPORT
SUPPORT RISERS SO THAT THEY ARE IN TENSION
FIGURE FIGUR E 4-7 RISER SUPPOR SUPPORTS TS - FROM FROM FLOOR
4.14
HVAC Duct Construction Standards Metal and Flexible
Second Edition
FIG. A - SUGGESTED SIZING
Y
DUCT SIZE
BAND
457 x 300 mm 610 x 508 mm
38.1 x 1.61 mm 25 x 3.2 mm
X TABLE 4-4
Y
ALLOWABLE
FASTENER
ANCHOR FIG. A SHOWS SUPPLEMENTAL FASTENER LOCATIONS
DUCT GAGE
LOAD PER FASTENER*
0.48, 0.58 mm 0.70, 1.00 mm 1.31, 1.61 mm
11.3 KG 16 KG 23 KG
* WELD, BOLT OR NO. 8 SCREW (MIN.) DEVIATION PERMITTED BY OTHER ANALYSIS. X = 25 mm, Y = 51 mm; ADD OTHERS TO ACCOMODATE LOAD. MINIMUM OF 3 ON 610 mm WIDTH AND UP. ADD ALONG SIDES NEAREST ANCHORS.
Y
X
(HANGER)
Y
ANCHOR SEE KNEE BRACKET TABLES IN THE ROUND INDUSTRIAL STDS. FIG. B - SUGGESTED SIZING ANGLE
DUCT SIZE ANCHOR FIG. B
NOTES:
762 x 305 mm 914 x 457 mm 1067 x 610 mm 1219 x 914 mm
25 x 25 x 3.2 mm 25 x 25 x 3.2 mm 31.8 x 31.8 x 3.2 mm 31.8 x 31.8 x 3.2 mm
1. BRACKETS ARE SIZED FOR 3.7 M OF DUCT, MAXIMUM. 2. LOCATE DUCTS AGAINST WALL OR MAXIMUM OF 51 mm AWAY FROM WALL. 3. EACH WALL ANCHOR SHALL SATISFY THE FOLLOWING CRITERIA UNLESS OTHER ANALYSIS IS MADE: A. TENSILE LOAD = 3/8 x DUCT WEIGHT; SAFETY FACTOR 4. B. SHEAR LOAD x 1/2 x DUCT WEIGHT; SAFETY FACTOR 4.
FIGURE 4-8M SUPPORT FROM WALL
HVAC Duct Construction Standards Metal and Flexible
