Pentek RFC Radial Flow Carbon Cartridge (4.5 x 20") RFC20-BB This is the right housing to choose for whole home filtration RFC Series cartridges are constructed with a 70-micron porous polyethylene outer shell and durable polypropylene end caps. The 2-3/4" OD cartridges have a polypropylene core and the 4-1/2" OD cartridges incorporate a spun polypropylene core. Sandwiched between the outer shell and the core is a bed of granular activated carbon (GAC). RFC Series cartridges are manufactured using a patented process and made entirely from FDA-compliant materials. They are an ideal choice for a wide range of residential, food service, commercial and industrial applications. They also make excellent polishing filters or pre-filters in applications requiring fine filtration and high capacity. Features, Options and Benefits Provides effective chlorine taste & odor reduction BB cartridges are ideal for point-of-entry (POE) and other high flow rate applications Unique design reduces carbon fines in filtered water Available in a wide variety of sizes NSF Certifications The RFC-93 is Tested and Certified by NSF International to NSF/ANSI Standard 42 for material requirements only. Model:�RFC20-BB Maximum Dimensions:�4 1/2" x 20" (114 mm x 508 mm)� Initial ∆P (psi) @ Flow rate (gpm):�0.60 psi @ 4 gpm (0.06 bar @ 15.1 Lpm Chlorine Taste & Odor Reduction @ Flow rate:�70,00 gallons @ 4 pgm (265,000L @ 15.1 Lpm) Materials of Construction Filter Media:�Granular Activated Carbon Outer Shell:�Polyethylene End Caps:�Polypropylene Gasket:�Buna-N Temperature Rating:�40–125�F (4.4–51.7�C) � Filter Media Granular Activated Carbon End Caps Polystyrene Post-Filter Spun Polypropylene Outer Casing Polystyrene Expansion Pad Polypropylene Gasket Buna-N (top) Santoprene (bottom) Temperature Rating 40–125�F (4.4–51.7�C) �