CPVC Duct Product Ratings

GF Harvel CPVC Duct performs well when exposed to harsh environments. This was demonstrated by testing conducted at an independent test facility to determine critical collapse pressures. GF Harvel CPVC Duct was taken to extremes under various negative pressure conditions to validate the product’s structural integrity at elevated temperatures when exposed to severe conditions. The negative pressure ratings shown in the table to the right are based on actual testing of CPVC Duct at various temperatures and incorporate a 1.5:1 safety factor.

MAX. Internal Negative Pressure Rating

Inches of Water @ Various Temperatures °F
SIZE TEMPERATURE °F
73 100 120 140 160 180 200
6" 426 371 316 263 208 153 98
8" 193 168 143 118 93 70 45
10" 100 86 73 60 48 35 23
12" 60 51 43 36 28 20 13
14" 45 38 33 26 21 15 10
16" 30 26 21 18 13 10 6
18" 26 23 20 16 13 10 6
20" 28 25 21 16 13 10 6
24" 20 18 15 13 10 6 3
PSI = Inches of Water x .0361; Inches of Mercury = Inches of Water x .07355

 

Positive Pressure GF Harvel CPVC Duct can endure greater levels of positive internal pressure than negative internal pressure. The table to the right shows the maximum recommended internal pressure rating in PSI for GF Harvel CPVC Duct at various temperatures. NOTE: Maximum values stated are for extruded duct pipe only, and incorporate a 1.5:1 safety factor. Consideration should be given to system design, method of fabrication, and joining which may require additional system derating. The use of compressed air or gases is not recommended for use with GF Harvel PVC/CPVC Duct piping.

MAX. Internal Positive Pressure Rating

PSI @ Various Temperatures °F
SIZE TEMPERATURE °F
73 100 120 140 160 180 200
6" 70 56 45 35 26 16 13
8" 53 43 33 26 20 13 10
10" 43 35 28 21 16 10 8
12" 36 30 23 18 15 8 6
14" 33 26 21 16 13 8 6
16" 28 23 18 13 11 6 5
18" 25 20 15 11 10 5 5
20" 26 21 16 13 10 6 5
24" 25 20 15 11 10 5 5