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Open by-pass fume hood

• Designed for operation on constant air volume exhaust systems
• The air by-pass provides for an alternate route for air to enter the hood as the sash is closed
• The size of the by-pass is set so that, as the sash is closed, the velocity of the air increases to no more than 3.5 times the velocity with the sash fully open.

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Low constant volume fume hood

• These fume hoods use a restricted sash opening or a lower face velocity, or both to reduce the exhaust quantity of air
• Traditionally, such fume hoods can reduce the exhaust CFM from 40% to 60% from Open By-pass levels.

[/boc_list_item][boc_list_item has_icon_color=”yes” icon_color=”#224a98″ icon=”icon icon-mail-forward”]Restricted by-pass fume hood

• Designed for operation on variable air volume (VAV) exhaust systems when used with a fume hood face velocity controller
• By reducing the amount of air exhausted, as the sash is lowered, a constant face velocity is maintained, exhausting less air than a Constant Volume hood.

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Auxiliary air fume hood

• Auxiliary Air fume hoods are Constant volume hoods designed for use when it is not feasible to introduce the required makeup air through the room ventilation system.
• Up to 70% of the exhaust volume can be supplied through an auxiliary air chamber mounted above the hood.
• These hoods require a separate ducted fan system for the supply of the auxiliary air.

https://www.kewaunee.in/laboratory-fume-hood.php

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