Reduction of heater noise in vinyl greenhouses. II: Reduction of noise
Umeda, S.; Mohri, K.; Murata, T.; Morita, S.
Journal of the Society of Agricultural Machinery 40(1): 99-103
Heater noise in a greenhouse was reduced by 7-9 dB(A) by using a sound proof wall consisting of a perforated wooden plate with an air layer and sound absorbing urethane foam and chaff.