18 Common Silencing Problems

and Their Solutions

	1		Limited silencer Connection Sizes
	2		Low Frequency Noise
	3		Insufficient straight duct
	4		Duct breakout noise
	5		Compounded problems
	6		Roof top unit noise
	7		High velocity airflow
	8		Energy consumption
	9		Insufficient duct length
	10		Acoustical duct lining
	11		Exposed glass fiber in ducts
	12		Unreliable ratings
	13		Unacceptable installed performance
	14		Environmental noise
	15		Severe environmental conditions
	16		Very small equipment rooms
	17		Fans in occupied space
	18		Ultra critical sound criteria