Rectangular Smoke Dampers
UL 555S classified with leakage class I, II, or III
Rectangular Smoke Dampers
UL 555S classified with leakage class I, II, or III

Smoke dampers can be closed and prevent the circulation of air and smoke through a duct or ventilation opening in a smoke barrier. Smoke dampers are UL 555S classified with leakage class I, II, or III.

SMD-201
SMD-201
Class I leakage rating with 3V blades and velocity up to 2,000 fpm; temperature up to 350°.
https://catalog-api.greenheck.com/api/product/en-us/seo/smd-201
SMD-201M
SMD-201M
Modulating damper with class I leakage rating, 3V blades and velocity up to 2,000 fpm; temperature up to 250°.
https://catalog-api.greenheck.com/api/product/en-us/seo/smd-201m
SMD-202
SMD-202
Class II leakage rating, 3V blades and velocity up to 2,000 fpm; temperature up to 350°.
https://catalog-api.greenheck.com/api/product/en-us/seo/smd-202
SMD-203
SMD-203
Class III leakage rating with 3V blades and velocity up to 2,000 fpm; temperature up to 350°.
https://catalog-api.greenheck.com/api/product/en-us/seo/smd-203
SMD-301
SMD-301
Has a class I leakage rating with airfoil blades; pressure to 8 in. wg; velocity to 4,000 fpm and temperature up to 350°
https://catalog-api.greenheck.com/api/product/en-us/seo/smd-301
SMD-301M
SMD-301M
Modulating with airfoil blades and class I leakage rating; pressure to 4 in. wg; velocity to 2,000 fpm and temperature up to 250°.
https://catalog-api.greenheck.com/api/product/en-us/seo/smd-301m
SMD-301V
SMD-301V
Airfoil blades and class I leakage rating; pressure to 4 in. wg; velocity to 4,000 fpm and temperature up to 350°.
https://catalog-api.greenheck.com/api/product/en-us/seo/smd-301v
SMD-302
SMD-302
Class II leakage rating with airfoil blades; pressure to 8 in. wg; velocity to 4,000 fpm and temperature up to 350°.
https://catalog-api.greenheck.com/api/product/en-us/seo/smd-302
SMD-302M
SMD-302M
A modulating damper with class II leakage rating and airfoil blades; pressure to 4 in. wg; velocity to 2,000 fpm and temperature up to 250°.
https://catalog-api.greenheck.com/api/product/en-us/seo/smd-302m
SMD-401
SMD-401
Has extruded aluminum blades with class I leakage rating; pressure to 6 in. wg; velocity to 3,000 fpm and temperature up to 250°.
https://catalog-api.greenheck.com/api/product/en-us/seo/smd-401
SMD-401EF
SMD-401EF
Class I leakage rating with extruded aluminum blades and frame; pressure to 6 in. wg; velocity to 3,000 fpm and temperature up to 250°.
https://catalog-api.greenheck.com/api/product/en-us/seo/smd-401ef
SMD-401M
SMD-401M
Modulating with extruded aluminum blades and class I leakage rating; pressure to 4 in. wg; velocity to 2,000 fpm and temperature up to 250°.
https://catalog-api.greenheck.com/api/product/en-us/seo/smd-401m
SESMD-201
SESMD-201
Class I leakage rating with 316 stainless steel construction, 3V blades and velocity up to 2,000 fpm; temperature up to 350°.
https://catalog-api.greenheck.com/api/product/en-us/seo/sesmd-201
SSSMD-201
SSSMD-201
Has 304 stainless steel construction with 3V blades and class I leakage; pressure to 6 in. wg; velocity to 2,000 fpm and temperature up to 350°.
https://catalog-api.greenheck.com/api/product/en-us/seo/sssmd-201
HSD-401
HSD-401
Class I leakage rating with aluminum airfoil blades and velocity up to 3,000 fpm; temperature up to 250°.
https://catalog-api.greenheck.com/api/product/en-us/seo/hsd-401