WAC 296-99-060
How must filter collectors be installed? (1) The employer must ensure that, on a pneumatic dust collection
system, each fabric dust filter collector has a monitoring device
that will show a pressure drop across the surface of its filter.
(2) The employer must ensure that each filter collector
installed after March 30, 1988, is:
(a) Located outside the facility; or
(b) When located inside the facility, protected by an
explosion suppression system; or
(c) Isolated by a structure with at least a one hour
fire-resistance rating:
•
Next to an exterior wall;
•
Vented to the outside; and
•
The vent and ductwork must resist rupture from intense
heat.