Specification Sheet
Table Of Contents
457
OPTIONS/ACCESSORIES
Aluminum Birdscreens: Consists of .060” thick 1/2” x 1” diamond shape expanded aluminum. Attached
to the full perimeter opening of the hood with stainless or zinc plated fasteners.
Hinged Hood: For easy access to backdraft dampers and to service lters and screens.
Insulated Hood: To reduce condensation drip. Offered in rubberized anti-condensate undercoating or
as 1” thick berglass insulation.
Filters: Offered as 1” or 2” thick permanent type aluminum mesh mounted for easy cleaning and
attached to full perimeter opening of the hood. Birdscreens are omitted when equipped with lters.
Note: Add .17” to the area listed in the tables when using lters on AIR INTAKE ventilators.
Insect Screen: Consists or 18 mesh aluminum screen. Attached to the full perimeter opening of the
hood. Note: When using insect screens on EXHAUST ventilators add .10” to the area listed in the
tables. For INTAKE ventilators add .05” to the listed area.
Roof Curb: Prefabricated heavy-gauge galvanized steel, welded construction, 12” high
(other heights are also available) with 1-1/2” wood nailer. Assures perfect t of to roof
opening. Options include burglar bars, single or double pitch construction and hinged
curbs for easy duct access.
Special Coatings: for protective and decorative purposes. Available coatings include: Synthetic
Resin, Epoxy, and Heresite (air-dried phenolic). Contact your representative or the factory for more
information on available coatings and colors.
MODEL BGH
FABRICATED GRAVITY RELIEF/INTAKE VENTILATORS