Liners

Silencer Section
Price offers an extensive system of liners available with the SDEQ product line. These liners offer various degrees of fiberglass protection suitable for hospital, pharmaceutical, laboratory, and other types of clean room applications.
While specifying liners for SDEQ construction of both the terminal and silencer sections need to be selected:

  • The terminal unit itself can be built with our typical selection of liners available for Single Ducts and other Price terminals CRAF is provided as standard other typical Price liners are also available – SM, PM, AFPM, WFPM, CRAF, CRWF, FF, and FB. See product SDV liner section for full description of those liners.
  • The VAV silencer section of SDEQ terminals can be manufactured with two types of “hospital grade” liners – TD ( tedlar) and FC (fiberglass cloth)
     
PL - Polmer Film Liner System
Polymer film wrapped around fiberglass media packed inside of the silencer. The polymer film and perforated metal facing the air are separated with an acoustical stand off. This is a typical industry construction for silencers where fiberglass isolation is required. Polymer film is a reflective material so less sound absorption is expected from a silencer lined with it (see performance charts). Note that polymer film and acoustical stand off are both rated below 25/50 for flame and smoke development per ASTM E 84 and as such meets NFPA90A.
   PL Liner System complies with the following industry standards and tests:
 
  • UL 181 (Air Erosion)
  • UL 181 (Mold Growth & Humidity)
  • UL 723 (25/50) (Flame & Smoke)
  • ASTM E 84 (25/50) (Flame & Smoke)
  • ASTM C 665 (Fungi Resistance)
  • ASTM C 1071 (Physical Properties)
 
FC - Fiberglass Cloth Liner System
Standard construction features of the Price PL features tightly woven fiberglass cloth wrapped around fiberglass media and covered with perforated metal liner which is facing the air stream inside of the silencer. The cloth prevents shedding of fiberglass media but as a porous material it does not compromise the sound absorption. This liner offers optimum sound performance, basically no correction factors have to be taken into an account and performance equal to fiberglass lined silencers is achievable. Note that fiberglass cloth is rated below 25/50 for flame and smoke development per ASTM E 84 and as such meets NFPA90A.
   FC Liner System complies with the following industry standards and tests:
 
  • UL 181 (Air Erosion)
  • UL 181 (Mold Growth & Humidity)
  • UL 723 (25/50) (Flame & Smoke)
  • ASTM E 84 (25/50) (Flame & Smoke)
  • ASTM C 665 (Fungi Resistance)
  • ASTM C 1071 (Physical Properties)
 
CRAF - Cleanroom Aluminum Foil System
Cleanroom Aluminum Foil System
   The fiberglass insulation and aluminum foil liner complies with the following industry standards and tests:
   
 
  • UL 181 (Air Erosion)
  • UL 181 (Mold Growth & Humidity)
  • UL 723 (25/50) (Flame & Smoke)
  • ASTM E 84 (25/50) (Flame & Smoke)
  • ASTM C 665 (Fungi Resistance)
This system integrates a rigid 4 lb. density fiberglass insulating material with an aluminum foil facing. All edges are sealed with metal endcaps and corner angles to prevent particles from entering the airstream.

The liner’s integrity is maintained where the damper shaft penetrates the insulation by a flanged nylon bushing. To reduce risk of liner damage during installation, sealed-in-place s-cleats are provided at the discharge collar.

The inlet duct is sealed to the internal insulation with mold-resistant caulking which meets ASTM D-4300.		  

Acoustic absorption of aluminum foil lined insulation is reduced compared to standard unlined units. The aluminum foil liner is non-porous, thereby protecting the insulation from moisture. The smooth surface of the liner reduces the risk of micro-organisms being trapped in the material and also facilitates cleaning. Damage to the liner can expose fiberglass particles to the airstream.

The following thicknesses are available
• CRAF - 5/8" (16) thick
• CRAF1 - 1" (25) thick