QF Bell Mouth Hood

QF Bell Mouth Hoods are small hoods used for local exhaust ventilation and are especially good for capturing fumes and dusts while providing a very low hood entry loss. They are economically priced and can be quickly produced and available in a wide range of sizes, from 3 to 24”. The QF (rolled edge) end allows quick connection to duct fittings. The bell begins as 18ga and thickness cannot be changed. Collars are constructed of galvanize metal standard 22 or 20ga with an optional 18ga, and are also available in 304SS standard 22ga with an optional 20ga.
Login or Create an Account to get Pricing for this part and to Build a Bill of Material List for your Ducting project.

Quick Fit Bell Mouth Hoods are small hoods used for local exhaust ventilation and are especially good for capturing fumes and dusts while providing a very low hood entry loss. QF Bell Mouth Hoods have a flared end to increase the capture ratio of air, dust, and smoke as well as increase laminar air flow. They are economically priced and can be quickly produced and available in a wide range of sizes.

QF Bell Mouth Hoods are manufactured as follows:

  • The Bell section is constructed from a solid sheet of a 18 gauge galvanized metal with no seams
  • Collars are constructed of galvanize metal standard 22 or 20 gauge with an optional 18 gauge, and are also available in stainless steel standard 22 gauge with an optional 20 gauge with a laser welded longitudinal seam
  • Collars are attached to the body using a raised hemmed seam spot welded and caulked
  • Round Ends are standard Quick Fit and come in diameter sizes of 3 and 24 inches
  • Bell section is constructed with a standard sheet of 18 gauge Galvanized metal with no seams
  • Standard QF ends can be changed to Raw with a defined ID dimension (RawID), Raw with a defined OD dimension (RawOD), No Fitting or just a raw end (NoFit), Flexible hose adapter (RawFlex), Flat Flange (FFL), Angle Flange (ANGFL), or Van Stone (VanStone).
Size
in.
Galv. (collar only)
ga.
304SS (collar only)
ga.
Wgt.
lbs.
Length
in.
OD
in.
ID
in.
Rolled Edge
in.
Bell OD
in.
Flat Rim
in.
3 22 22 0.90 4.5 3.07 3.00 0.2 8 1.00
4 22 [18] 22 [20] 1.05 4.5 3.89 3.82 0.2 9 1.00
5 22 [18] 22 [20] 1.15 4.5 4.91 4.84 0.2 10 1.00
6 22[18] 22 [20] 1.85 5.0 5.93 5.86 0.2 12 1.25
7 22 [18] 22 [20] 1.95 5.0 6.94 6.87 0.3 13 1.25
8 22 [18] 22 [20] 2.10 5.0 7.93 7.86 0.3 14 1.25
9 22 [18] 22 [20] 2.25 5.0 8.92 8.85 0.3 15 1.25
10 22 [18] 22 [20] 3.00 6.0 9.93 9.86 0.3 16 1.25
11 22 [18] 22 [20] 3.70 6.0 10.92 10.85 0.3 19 1.25
12 22 [18] 22 [20] 4.10 6.0 11.99 11.92 0.4 20 1.25
13 22 [18] N/A 4.50 6.0 13.00 12.92 0.4 21 1.25
14 20 [18] N/A 5.75 6.0 13.99 13.91 0.4 22 1.25
15 20 [18] N/A 6.25 6.0 14.99 14.91 0.4 23 1.50
16 20 [18] N/A 7.50 7.0 16.00 15.92 0.4 26 1.50
17 20 [18] N/A 8.25 7.0 17.00 16.92 0.4 27 1.50
18 20 [18] N/A 9.50 7.0 17.99 17.91 0.4 28 1.50
19 20 [18] N/A 10.10 7.0 19.05 18.93 0.4 29 1.50
20 20 [18] N/A 10.75 7.0 20.00 19.92 0.4 30 1.50
21 20 [18] N/A 11.50 8.0 21.02 20.94 0.4 31 1.75
22 20 [18] N/A 12.25 8.0 22.01 21.93 0.4 34 1.75
23 20 [18] N/A 12.90 8.0 23.01 22.93 0.4 35 1.75
24 20 [18] N/A 14.50 8.0 23.98 23.90 0.4 36 1.75
Galvanized Gauge Metal Thickness
Gauge Inches Millimeters
22 0.0366 0.85
20 0.0396 1.01
18 0.0516 1.31
Stainless Gauge Metal Thickness
Gauge Inches Millimeters
22 0.031 0.79
20 0.0375 0.95
NOTES:
  1. At temperatures ranging between 390° F and 480° F, the zinc-iron alloy layers in the galvanized steel will continue to provide a high level of protection from corrosion. However, there may be some peeling, changes in mechanical properties, and reduction in the corrosion protection. Recommended maximum service temperature is 390° F.
  2. For 304 SS metal, bluing may occur at temperatures of 800° F and above.
  3. Rock River Silicone Sealant and Red Devil HVAC/R High Temperature Silicone Sealant are not able to be painted.
Item Material Compliance/Rating
QF Bell Mouth Hood Galvanized ASTM A653 with a G-90 Rating
304 SS Finish meets ASTM A240
316 SS Finish meets ASTM A240
3M Scotch Seal Metal Sealant 2084 Acetone blend AAMA Specification 801.1
Rock River Silicone Sealant 100% Silicone ASTM C920 Class 25
TT-S-00230C Class A and TT-S-001543A
FDA No. 421 CFR 117.2600, conforms to FDA requirements
Red Devil HVAC/R High Temperature Silicone Sealant Silicone ASTM C920 Class 25
TT-S-00230C Class A and TT-S-001543A
CEBTP 432.6 140-2
Mil Spec 46106A
CGSB 19C9-9B
DIN 18540 Part 2
OREX 150031-2
Copyright © 2018 QF Ducting. All rights reserved.