Summary of the content on the page No. 1
SMD-401M
Smoke Dampers
Extruded Airfoil Blades
UL 555S Leakage Class I
APPLICATION
Model SMD-401M is a class I leakage rated modulating smoke Model SMD-401M meets the requirements for smoke
damper. The model SMD-401M serves the function of dampers established by:
both a control damper and smoke damper. High strength airfoil National Fire Protection Association
blades ensure the lowest resistance to airflow in HVAC systems NFPA Standards 92A, 92B, 101 & 105
with velocities to 2000 fpm (10.
Summary of the content on the page No. 2
SMD-401M Pressure Drop Data This pressure drop testing was conducted in accordance with AMCA Standard 500-D using the three configurations shown. 3 3 All data has been corrected to represent standard air at a density of .075 lb/ft (1.201 kg/m ). Actual pressure drop found in any HVAC system is a combination of many factors. This pressure drop information along with an analysis of other system influences should be used to estimate actual pressure losses for a damper installed in a given HVAC
Summary of the content on the page No. 3
Application Data Damper Sideplate and Sleeve Dimensional Data The drawings below illustrate the factory standard sideplate and sleeve mountings for the SMD-401M. The standard "A" dimensions listed in the table provide adequate space for the mounting of actuators and controls. 3 If space constraints are a problem the "A" dimension can be varied between 5 ⁄8 in. (136mm) and 12 in. (305mm). 1 1 /2" max. Sideplate 1 1 /2" max. Sleeve 1 1 /2 in. max. "A" Dimension 3 3 /4" in. (mm) Sleeve Sideplate S
Summary of the content on the page No. 4
Transitioned Damper Dimensions When a fire/smoke damper is being used in conjunction with round or oval ductwork, the SMD-401M can be supplied in a factory sleeve with round or oval transitions on both ends of the sleeve. Dampers should be ordered to the duct dimensions. Drawings below show overall damper size. D*+ 2 in. (51mm) +T s W*+ 2 in. (51mm)+T s W*+ 2 in. (51mm)+T s D* + 2 in. (51mm)+T s H* + 2 in. (51mm)+T H*+ 2 in. (51mm)+T s s H* 1 H* 1 2 /8 in. 2 /8 in. 1 2 /8 in. (54mm) (54mm
