Spec Sheet The newest of the Rotary offerings, Knauf Atmosphere replaces their Sonic XP with the first Duct Liner that is formaldehyde free. Cuts well, no dust, tightly bonded mat facing, fire-resistant, excellent sound absorption and UL green guard gold certified. Category: Fiberglass Duct Liner Item Codes: KL12X3512 1/2″ x 35-1/2″ x 100′ 2# Knauf Rotary Duct Liner #503743 KL12X4712 1/2″ x 47-1/2″ x 100′ 2# Knauf Rotary Duct Liner #503880 KL12X5912 1/2″ x 59-1/2″ x 100′ 2# Knauf Rotary Duct Liner #503889 KL1X3512 1″ x 35-1/2″ x 100′ 1.5# Knauf Rotary Duct Liner #503410 KL1X4712 1″ x 47-1/2″ x 100′ 1.5# Knauf Rotary Duct Liner #503424 KL1X48 1″ x 48″ x 100′ 1.5# Knauf Rotary Duct Liner #503425 KL1X5614 1″ x 56-1/4″ x 100′ 1.5# Knauf Rotary Duct Liner #503434 KL1X5914 1″ x 59-1/4″ x 100′ 1.5# Knauf Rotary Duct Liner #503448 KL1X5912 1″ x 59-1/2″ x 100′ 1.5# Knauf Rotary Duct Liner #503449 KL112X4712X50 1-1/2″ x 47-1/2″ x 50′ 1.5# Knauf Rotary Duct Liner #503678 KL112X5912X50 1-1/2″ X 59-1/2″ x 50′ 1.5# Knauf Rotary Duct Liner #503701 KL2X3512X50 2″ x 35-1/2″ x 50′ 1.5# Knauf Rotary Duct Liner #503713 KL2X4712X50 2″ x 47-1/2″ x 50′ 1.5# Knauf Rotary Duct Liner #503721 KL2X5614X50-1.5 2″ x 56-1/4″ x 50′ 1.5# Knauf Rotary Duct Liner #503729 KL2X5912X50 2″ x 59-1/2″ x 50′ 1.5# Knauf Rotary Duct Liner #503734
