GI and GR - Gravity Intake and Relief Cutsheet.pdf
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- Solicitation number
- 47PB5126R0008
- Issued by
- Not on record
About this file
This document is a product cut sheet for Greenheck roof-mounted dampers, specifically featuring two models: the GRSI-18 and GRSR-12.
The GRSI-18 (Mark GV-1) is an 18-inch ducted damper with aluminum housing and a prepunched aluminum curb cap. It measures 33.5 inches by 35.5 inches with a throat area of 1.83 square feet and performs at 950 CFM with a static pressure of 0.045 inches of water gauge and throat velocity of 519 feet per minute. The unit weighs 19 pounds and includes a flashing flange, insect screen, and galvanized birdscreen material. The GRSR-12 (Mark GR-1) is a 12-inch non-ducted damper measuring 22 inches by 29 inches with a throat area of 0.82 square feet, performing at 500 CFM with a static pressure of 0.046 inches of water gauge and throat velocity of 610 feet per minute. This unit weighs 10 pounds and features no flashing flange or insect screen, though it includes a galvanized birdscreen. Both models feature standard aluminum construction with aluminum curb caps with prepunched mounting holes and recommend a minimum roof opening dimension of 2.5 inches larger than the damper size. Neither model includes optional accessories such as hinged curb caps, curb seals, hood insulation, or tie-down points. The cut sheet is dated October 29, 2025, and is marked as not for submittal.
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Text version
B
F A
D C
Model: GRSI Standard Construction Features:
- Aluminum housing. - Aluminum curb cap with prepunched mounting holes. - Recommended roof opening dimension is at least 2.5 in. larger than the damper size.
Dimensions
ID# Tag Qty Model Model Size
(in.) A (in.) B (in.) C (in.) D (in.) E (in.) F (in.)
Curb Cap Width (in.)
Curb Cap Length
(in.)
Weight
(lb)
1-1 GV-1 1 GRSI-18 18 33.5 35.5 11.5 1.75 31.25 20.25 33.5 33.5 19
Performance
ID# Tag Qty Volume (CFM) SP (in. wg)
Throat Area (ft2)
Throat Velocity (ft/ min)
1-1 GV-1 1 950 0.045 1.83 519
Construction
ID#
Flashing Flange
Installation Type
Insect Screen
Birdscreen Material
Unit Material
1-1 Yes Ducted Yes Galvanized Aluminum
Accessories
ID#
Hinged
Curb Cap Curb Seal
Hood Insulation
(in.)
Tie Down
Points 1-1 No No None No
Cut Sheet - Not for Submittal 10/29/2025Printed Date:
GV-1Mark:
GRSIModel:
Generated by: sheckman@rfsengineering.comCAPS 4.45.1065 Page 1 of 2 C:\Users\smh1028\OneDrive - RFS Engineering\Documents\CAPS\Jobs\10199.gfcj
B
F A
1.75
D C
Model: GRSR Standard Construction Features:
- Aluminum housing. - Aluminum curb cap with prepunched mounting holes. - Recommended roof opening dimension is at least 2.5 in. larger than the damper size.
Dimensions
ID# Tag Qty Model Model Size
(in.) A (in.) B (in.) C (in.) D (in.) E (in.) F (in.)
Curb Cap Width (in.)
Curb Cap Length
(in.)
Weight
(lb)
2-1 GR-1 1 GRSR-12 12 22 29 11.75 3.5 N/A 12.25 22 22 10
Performance
ID# Tag Qty Volume (CFM) SP (in. wg)
Throat Area (ft2)
Throat Velocity (ft/ min)
2-1 GR-1 1 500 0.046 0.82 610
Construction
ID#
Flashing Flange
Installation Type
Insect Screen
Birdscreen Material
Unit Material
2-1 No Non-Ducted No Galvanized Aluminum
Accessories
ID#
Hinged
Curb Cap Curb Seal
Hood Insulation
(in.)
Tie Down
Points 2-1 No No None No
Cut Sheet - Not for Submittal 10/29/2025Printed Date:
GR-1Mark:
GRSRModel:
Generated by: sheckman@rfsengineering.comCAPS 4.45.1065 Page 2 of 2 C:\Users\smh1028\OneDrive - RFS Engineering\Documents\CAPS\Jobs\10199.gfcj
File details come from the government source that posted it. Updated .