For most applications a rating of r 6 or better will provide the best efficiency and long term cost effectiveness.
													
																	Duct liner insulation r value. 
									
	
		
	
																	It provides acoustical and thermal performance for lined metal ducts. 
																	Because it never gets very cold in florida you don t need duct insulation with as high an r value as you would if you lived up north. 
																	For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. 
																	Value operating temperature astm c411 250 f 121 c maximum air velocity ul 181 erosion test astm c1071 6 000 fpm 30 5 m sec water vapor sorption by weight astm c1104 3 at 120 f 49 c 95 r h. 
															
													
									
	
		
	
																	Jm offers this product as part of our commitment to providing a complete range of product solutions. 
																	Fungi resistance astm c1338 meets requirements fungi resistance astm g21 meets requirements. 
																	Composed of rotary type glass fibers it features a durable air stream surface with an antimicrobial agent and a sustainable base mat. 
																	The antimicrobial properties are intended to only protect this prodcut. 
															
													
									
	
		
	
																	Toughgard r rotary duct liner offers outstanding thermal and acoustical performance in duct liner applications. 
																	Purchasing the ducting and the insulation separately is often more cost effective and has a greater variety of options when it comes time to choose the r value of your insulation. 
																	Typically r 4 to r 8 is appropriate for the ducts within the insulated part of your home.