Page 193 - FanPedia - By Aerovent

®
FAN-PEDIA SPECIAL CONSTRUCTION
Published by AEROVENT.COM
Aerovent NOMINALLY LEAK-TIGHT
©2017

Continuous Weld GENERAL INFORMATION
> Weld locations vary by model A fan generally cannot be constructed to be totally leak tight. Hence
the term “Nominally Leak Tight” is used. This type of construction is
Gasketing used to reduce leakage to within acceptable levels decided upon with
> Double gaskets required the customer. Fans are tested at the shop with a Soap Bubble Test to
check for leaks.
Shaft Seal Fan leakage refers to air (or other gas mixture) either leaking into
the fan housing or out of the fan housing. Leakage in or out depends
Drain on air pressure. When the air (or gas mixture) mixes with hazardous
contaminants, excessive leakage can be dangerous. Excessive leakage
> Pipe Coupling Type with Plug can waste energy, be an environmental or safety hazard, damage fan
bearings or create excessive noise.

- Fan Construction
> Arrangements 1, 8 and 9 only
> Solid drive side on housing (no drive plates)
> Not recommended for applications over 600 F
o
> Split housings not recommended
> Bolted connections must have close centered hole patterns (3”
to 4” centers) Includes: inlet and outlet flanges, access doors,
cover plates, inlet funnels, split housings, etc.

- Gasketing
> Use on all connections: inlet/outlet flanges, funnel, inlet plate,
access doors, split housing, etc.
> Split housings require centering plate to seal open areas by
shaft seals and inlet funnel or plate

- Shaft Seals (Fan Shaft - do not use shaft sleeve & cap)
> Lip type
> Stuffing Box (Graphoil) type
> Double Ring Mechanical type (Double Carbon Ring)

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