Explosion proof version of roof fans is used for ventilation of rooms in which explosive mixtures of flammable gases and liquid vapours with air may appear.
They may be used in such rooms as: acetylation, painter's, cleaner's, chemicals storerooms etc.
Series of types of the explosion proof roof fans includes 5 sizes.
The fans consist of:
statically and dynamically balanced highly efficient centrifugal rotor made of steel
The latter three elements are made of highly percussive and certificated plastic resistant against atmospheric effects in range of temperature: -
The fans may be used for forcing air which consists of gases and / or vapours of flammable liquids of the II explosion grade and temperature classes: T1, T2, T3 to extent corresponding with Z1 or Z2 categories of explosion hazard, but:
a)in case of Z2 category there may be gases and vapours of flammable liquids of any explosion subgroup i.e. IIA, IIB, IIC and temperature classes T1, T2, T3 in case of using motor with reinforced construction type KPER with ExellT3 marking.
b)in case of Z1 category there may be gases and vapours which belong to IIA and IIB explosive subgroups and to temperature classes T1, T2, T3, as it is specified in paragaph a.