S02 - SOW - Att 31 - Cut Sheet 09 - EHRM Infra Upgrades - Constr - Togus.pdf
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- Attached to
- Electronic Health Record Modernization Infrastructure Upgrades - Construction - Togus, ME
- Solicitation number
- 36C77626R0062
About this file
This is a product specification and performance document for the Greenheck Spun Aluminum Model GRSI/GRSR/GRSF gravity ventilators. The document provides detailed construction features, dimensions, and performance data for intake and relief ventilation units designed for natural gravity or positive pressure systems.
The GRSI model serves as an intake ventilator while the GRSR model functions as a relief unit, with both available in sizes ranging from 8 to 48 inches. Key construction features include all-aluminum exterior for corrosion resistance, integral birdscreen to prevent bird and debris entry, built-in curb cap with pre-punched attachment holes, and an optional flashing flange (GRSF model) for installations without roof curbs. The units deliver broad performance capacity up to 18,400 CFM (31,300 m³/hr) with advanced weather protection and extended durability through extensive life testing. A comprehensive dimensions table specifies measurements, damper sizes, curb and shroud thickness, and unit weights for all available model sizes. Performance tables present intake and relief capacities at varying total pressure drops from 0.04 to 0.35 inches water gauge, with maximum recommended intake velocities not exceeding 600 feet per minute to prevent moisture intrusion. Recommended maximum intake CFM values are provided for each size based on 600 ft/min velocity standards, and the document includes guidance that 12-inch or higher curbs are advisable in areas with significant snow depths. Complementary accessories include gravity or motorized dampers, prefab curbs, and protective coatings to enhance performance and service life.
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Text version
Construction Features When you buy a Greenheck gravity ventilator, you receive a ventilator with the industry’s best performance and durability for intake (model GRSI) or relief (model GRSR) for natural gravity or positive pressure systems. Exceptional low silhouette design and construction features make this unit a rugged, efficient, and economical air inlet or outlet.
• Broadest performance in the industry, up to 18,400 cfm (31,300 m3/hr)
• Most advanced weather protection of any ventilator in its class
• Greenheck subjects these products to extensive life testing, ensuring the ventilator will provide years of reliable performance
Optional Flashing Flange
Integral Birdscreen
Dimensions Model Size
A B C D E F Damper
Size Curb
Thickness Shroud
Thickness Unit
Weight
8 19 (483)
201⁄2 (521)
71⁄4 (184)
11⁄2 (38)
201⁄4 (514)
81⁄4
(210) 8 x 8
(203 x 203) 0.051 (1.3)
0.051 (1.3)
(3)
10 19 (483)
201⁄2 (521)
73⁄4 (197)
(51)
201⁄4 (514)
101⁄4 (260)
10 x 10 (254 x 254)
0.051 (1.3)
0.051 (1.3)
(4)
12 22 (559)
(737)
(254)
31⁄2 (89)
231⁄4 (591)
121⁄4 (311)
12 x 12 (305 x 305)
0.064 (1.6)
0.064 (1.6)
(5)
15 22 (559)
(737)
(254)
31⁄2 (89)
231⁄4 (591)
141⁄4 (362)
16 x 16 (406 x 406)
0.064 (1.6)
0.064 (1.6)
(6)
16 26 (660)
(737)
(279)
41⁄4 (108)
271⁄4
(692) 161⁄4 (413)
16 x 16 (406 x 406)
0.064 (1.6)
0.064 (1.6)
(7)
18 30 (762)
351⁄2 (902)
93⁄4 (248)
13⁄4 (44)
311⁄4 (794)
201⁄4 (514)
18 x 18 (457 x 457)
0.064 (1.6)
0.064 (1.6)
(9)
20 30 (762)
351⁄2 (902)
111⁄4 (286)
33⁄4 (95)
311⁄4 (794)
201⁄4 (514)
18 x 18 (457 x 457)
0.064 (1.6)
0.064 (1.6)
(11)
24 34 (864)
381⁄4
(972)
(279)
(102) 351⁄4 (895)
241⁄2 (622)
24 x 24 (610 x 610)
0.064 (1.6)
0.064 (1.6)
(13)
30 40 (1016)
(1219)
183⁄4 (476)
57⁄16
(138) - 301⁄2
(775) 30 x 30
(762 x 762) 0.064 (1.6)
0.064 (1.6)
(16)
36 46 (1168)
563⁄4 (1441)
211⁄4 (540)
(254) - 361⁄2
(927) 36 x 36
(914 x 914) 0.064 (1.6)
0.080 (2.0)
(20)
42 52 (1321)
631⁄4 (1607)
241⁄4 (616)
111⁄4
(286) - 421⁄2
(1089) 42 x 42
(1067 x 1067) 0.064 (1.6)
0.080 (2.0)
(27)
48 58 (1473)
(1829)
261⁄4 (667)
111⁄4
(286) - 481⁄2
(1232) 48 x 48
(1219 x 1219) 0.064 (1.6)
0.080 (2.0)
(36)
GRSI/GRSR - Sizes 30 - 48
B
F
F
F
1¾ (44)
1¾ (44)
D
D
D
A
A
E
C
C
C
B
B
GRSI/GRSR Sizes 8 - 24
B
F
F
F
1¾ (44)
1¾ (44)
D
D
D
A
A
E
C
C
C
B
B
All dimensions are in inches (millimeters) and the weight in pounds (kilograms). NOTE: Sizes GRS-8 through 24 have a one-piece cover and shroud. Access is gained through the removal of screws. Sizes GRS-30 through 48 have a removable cover, separate from the shroud, to facilitate maintenance and servicing of dampers.
GRSF - Sizes 8 - 24 with Optional Flashing Flange
B
F
F
F
1¾ (44)
1¾ (44)
D
D
D
A
A
E
C
C
C
B
B
• All aluminum exterior for corrosion-resistant construction
• Integral birdscreen to prevent the entry of birds and/or small objects
• Built-in curb cap with pre-punched holes for easy attachment to roof curbs
• Optional built-in flashing flange (model GRSF) with pre-punched holes for quick and easy installations without a roof curb.
Use the GRS with the following accessories:
Gravity or motorized dampers to ensure weather tightness.
Prefab curbs to reduce installation time.
Protective coatings to extend the life of the unit or blend its color with other equipment.
GRSF
Spun Aluminum Model GRSI/GRSR/GRSF
Volume (CFM) Recommended Maximum Intake Capacities
GRSI
Size
Throat Area (ft2 )
Total Pressure Drop (in. wg) Intake Area (ft2) Max. CFM Intake
0.04 0.06 0.08 0.10 0.15 0.20 0.25 0.30 0.35
M o d el
G R
S I
In ta ke P er fo rm an ce
8 0.37 178 218 252 282 345 398 445 488 527 1.30 780
10 0.57 279 342 395 442 541 624 698 765 826 1.72 1032
12 0.82 400 490 566 633 775 895 1001 1097 1184 2.52 1512
15 1.12 553 677 782 874 1071 1237 1383 1515 1636 2.57 1542
16 1.45 742 908 1049 1173 1436 1658 1854 2031 2194 3.02 1812
18 1.83 901 1104 1274 1425 1745 2015 2253 2468 2665 3.42 2052
20 2.25 1096 1343 1550 1733 2123 2452 2741 3002 3243 4.43 2658
24 3.24 1542 1888 2180 2438 2985 3447 3854 4222 4560 4.95 2970
30 5.03 2013 2465 2847 3183 3898 4501 5032 5512 5954 7.49 4496
36 7.29 2921 3577 4130 4618 5656 6531 7301 7998 8639 10.2 6111
42 9.77 3911 4791 5532 6185 7574 8746 9779 10712 11570 12.0 7159
48 12.8 5139 6294 7268 8126 9952 11491 12848 14074 15201 15.5 9286
GRSR
Size
Throat Area (ft2 )
Total Pressure Drop (in. wg)
0.04 0.06 0.08 0.10 0.15 0.20 0.25 0.30 0.35
M o d el
G R
S R
R el ie f
P er fo rm an ce
8 0.37 231 282 326 365 446 516 576 631 682
10 0.57 331 406 468 524 641 741 828 907 980
12 0.82 468 573 662 740 907 1047 1171 1282 1385
15 1.12 663 811 937 1048 1283 1481 1656 1814 1960
16 1.45 870 1065 1230 1375 1685 1945 2175 2382 2573
18 1.83 1060 1298 1499 1676 2052 2370 2649 2902 3135
20 2.25 1284 1572 1815 2029 2486 2870 3209 3515 3797
24 3.24 1879 2301 2657 2971 3638 4201 4697 5145 5558
30 5.03 2281 2794 3226 3607 4418 5101 5703 6247 6748
36 7.29 3279 4016 4637 5184 6349 7331 8197 8979 9699
42 9.77 4672 5722 6607 7387 9047 10447 11680 12795 13820
48 12.8 6211 7607 8783 9820 12027 13888 15527 17009 18372
Performance Performance data for these units was obtained through actual testing.
The information is presented in capacity versus total pressure drop through the GRS. Total pressure drop includes the static and velocity pressure drops. To find the static drop alone, use the following equations.
The data is presented for both discharge and intake units. The intake velocity of the intake unit should not exceed 600 feet per minute. Above this velocity, airborne particles may be carried into the building. The table below displays the maximum recommended values for the respective intake units. In areas where snow depths may be a problem, 12 inch (305 mm) or higher curbs are recommended.
Table is based on 600 ft/min.
maximum intake velocity. Above these values (numbers in gray), provisions should be made to contain incoming moisture.
Throat Velocity = [ ] CFM Throat Area
Static Pressure = [ ]
[ ]Total Pressure
Velocity Pressure = [ ]Throat Velocity
4008.6
Velocity Pressure
(in. wg)*
*1 inch wg = 249 Pa
Spun Aluminum Model GRSI/GRSR
ADR
Rectangle
ADR
Rectangle
File details come from the government source that posted it. Updated .