To exempt certain ducts from the application of Sentence 22.214.171.124.(1), which would otherwise require fire dampers, on
the basis that:
- the lack of fire dampers in this case will not lead
to a significant spread of fire,
- accidental closing of the fire dampers by the cooking
operations would lead to an undue hardship to the operations, or
- the fire dampers and their operating parts could collect
grease, be very difficult to clean, and add to the fire hazard.