Special Hazard
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Kitchen exhaust hood interior view, before and after cleaning.
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Rooftop fan on top of grease duct being cleaned in order to remove congealed grease.
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Top view of kitchen exhaust fan assembly on top of a grease duct - before and after cleaning.
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Bucket of kitchen exhaust grease after removal from commercial restaurant grease duct.
The grease laden vapors are hot, to begin with. As the vapours cool down, the grease settles on colder items. It is thus important for occupational safety and health as well as compliance with local fire codes to vent such vapours outside the kitchen and outside the building where the kitchen is located.
Grease, of course, is not only slippery, but also highly flammable. In fact, it qualifies as a hydrocarbon due to its inherent chemistry. Regardless of what state it is in, vapour, liquid or solid, it ignites easily and burns very rapidly, necessitating special provisions to accomplish a fire-resistance rating based on an internal grease fire as well as an external fire. Special provisions also include the necessity for proof that any adjacent firestop must be compatible with the grease duct system.
Read more about this topic: Grease Duct
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