through vertical portion of the ventilator base assembly flange using a minimum of eight (8) lug screws, anchor bolts, or other suitable fasteners (not furnished). Shims may be required depending upon curb installation and roofing material. Check all fasteners for tightness. The diagrams below show different mechanical installation configurations.
Adequate building relief shall be provided so as to
Recommended Supply Ductwork Sizes
Blower Size | Duct Size | Straight Duct Length |
10 | 14 x 14 | 48 in. |
12 | 16 x 16 | 54 in. |
15 | 20 x 20 | 72 in. |
18 | 24 x 24 | 86 in. |
20 | 26 x 26 | 108 in. |
25 | 32 x 32 | 168 in. |
not over pressurize the building when the heating
system is operating at its rated capacity. This can be accomplished by taking into account, through standard engineering methods, the structure’s designed infiltration rate; by providing properly sized relief openings; or by interlocking a powered exhaust system; or by a combination of these methods.
Heaters installed with intake ductwork must be purged to replace at least four air changes of the volume of the intake duct.
If the failure or malfunction of this heater creates a hazard to other fuel burning equipment in the building (e.g. when the heater is providing make up air to a boiler room), the unit is to be interlocked to open inlet air dampers or other such devices.
Units being installed in airplane hangars should be installed in accordance with the Standard for Aircraft Hangars, ANSI/NFPA 409. Units being installed in public garages should be installed in accordance with the Standard for Parking Structures, ANSI/NFPA 88A, or the Standard for Repair Garages, ANSI/NFPA 88B, and with CAN/CGA B149 Installation Codes.
Roof Mount Installation
Installation with Exhaust Fan
5
