Duct supports shall be designed to carry
the weight of the duct half filled with material. Where
sprinkler protection is provided or cleaning of duct will
be performed, the hanger's design shall include the
weight of the expected liquid accumulation. Duct
supports shall be designed to prevent placing loads on
connected equipment. [NFPA 91:4.5.1 - 4.5.3]
Exception: Where approved drainage is provided, the weight of the water shall not require consideration.
Exception: Where approved drainage is provided, the weight of the water shall not require consideration.