Labconco Coated Steel, Fiberglass and PVC Blowers 7183200 - Manual (Page 46)

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Chapter 7: Modifying Your Blower
Product Service 1-800-522-7658, International 816-333-8811
Backdraft Dampers
Designed for use in buildings under negative pressure to keep
outside air from entering the laboratory through the hood
ventilation system. Damper is weighted to stay in down/resting
position when the hood is not in use, and rises from the airflow
exhausting when the blower is on. It mounts vertically on blower
outlet. The damper is made of PVC Type 1, unplasticized,
schedule 40 duct.
Nominal Diameter/Inches 8 10 12
Catalog Number S304508 S304510 S304512
Shipping Wt./lbs. 15 18 20
Bird Screens
Screen attaches easily with screws to auxiliary-air blower inlet to
keep birds from nesting in blower.
Nominal Diameter/Inches 10 12
Catalog Number S122500 S122501
Shipping Wt./lbs. 5 5