1. Smoke Damper requirementS anD
application
Smoke dampers are required to close and prevent
the passage of air and smoke through ducts or
ventilation openings in smoke barriers. Smoke
dampers are also applied in engineered smoke
control systems to establish air pressure differentials
and thereby prevent the spread of smoke. These
dampers are designed to operate with blades running
horizontally. Dampers can be vertically or horizontally
installed at, in accordance with NFPA-90A, or
adjacent to the point where the duct passes thru the
smoke barrier.
2. location of Damper in Ductwork
Place the damper assembly in its proper position
relative to the barrier. The plane of the closed
damper blades must be within 24 in. (610mm) of the
rated smoke barrier and before any duct inlets or
outlets.
3. attaching Damper to the Duct
The damper is flange mounted to the duct, sleeve,
or wall opening with
using #10 sheet metal screws,
1/4 in. (6mm) diameter bolts and nuts, tack or spot
welds, or 3/16 in. (5mm) diameter steel pop rivets.
Attachments must be made at each flange spaced
a maximum of 6 in. (152mm) on centers and a
maximum of 2 in. (51mm) from corners.
4. Sealing the inStallation
The following duct sealants may be used to seal
between the dampers flange and the mating surface:
PA2084T duct sealant adhesive manufactured
by Precision, DP1010 water base duct sealant
manufactured by Design Polymetrics, Grey Pookie
or Ductmate PROseal® in accordance with SMACNA
recommendations.
5. actuator connectionS
Electrical and/or pneumatic connections to damper
actuators should be made in accordance with wiring
and piping diagrams developed in compliance with
applicable codes, ordinances and regulations.
part number 472664
inStallation inStruction Supplement
Refer to:
‘Installation Instructions for SMD, SESMD, SSSMD, SMDR,
SESMDR, and SSSMDR series Models’ (Part #)
for additional details.
flange mounted installation
SmD-xxx, SeSmD-xxx,
SSSmD-xxx Series
Smoke Dampers
“ul claSSifieD
(see complete marking on product)”
“ul claSSifieD to canadian safety standards
(see complete marking on product)”
Standards UL 555 & 555S
Classifications Filed at UL under Listing #R13317
Damper model
Maximum Single
Section Size
in. (mm)
Maximum Overall
Size for Multiple
Section Dampers
in. (mm)
SMD-301, 302
32 x 50
(813 x 1270)
128 x 100 or 256 x 50
(3251 x 2540) or
(6502 x 1270)
SMD-301M, 302M
32 x 50
(813 x 1270)
128 x 100 or 256 x 50
(3251 x 2540) or
(6502 x 1270)
SMD-401
48 x 60
(1219 x 7315)
192 x 72, 48 x 288,
or 384 x 36
(4877 x 1829,
1219 x 7315 or
9754 x 914)
SMD-401M
48 x 36
(1219 x 914)
144 x 36
(3658 x 914)
