
844-SUBDUCT (782-3828)
Producer and Patent Holder
of low-profile subduct risers for multistory buildings.

Low-Profile Subduct Riser (LSR)
U.S. Patent No. 8,267,759
ABOUT US

Subduct Riser Manufacturing offers low-profile subduct risers made of 26 gauge galvanized steel. The LSR is beneficial in applications where a 22 inch subduct riser is necessary to maintain the fire and smoke rating of an exhaust shaft instead of using fire and smoke dampers. The LSR is IBC- and IMC-compliant for bathroom, kitchen, and clothes dryer exhaust shafts.
The LSR is available with female inlet connections of 4, 5, 6, 8 and 10 inches. Surrounded by a 3/8 inch flange, the LSR attaches firmly to the inside wall of the exhaust shaft, eliminating the possibility of loose or disconnected risers. The LSR pro-vides the minimum 22 inch rise while maintaining a low profile. Using LSR risers as an alternative to conventional field-erected subducts results in lower velocities and less restriction in the main exhaust shaft allowing for smaller main shafts with less generated noise.
PRODUCTS
LSR 04
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Dimensions
V: 4"
L: 27"
W: 6"
D: 2"
LSR 04 vs Conventional Subducts
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The flow area through a 10" x 10" is 52% larger than using tw LSR04s instead of two 4" convential subducts
LSR 05
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LSR 06
Dimensions
V: 6"
L: 30"
W: 9"
D: 3.5"
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LSR 08
Dimensions
V: 8"
L: 32"
W: 12"
D: 4.5"
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LSR 10
Dimensions
V: 10"
L: 34"
W: 15"
D: 6"
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