Media Velocity Panel vs Extended Surface NAFA Technical Seminar May 2004

HVAC Filter Styles Panel Filters Up to MERV 8 performance Throwaway Pad Polyester, Fiberglass Ring Panel Sleeve, Link Autoroll Up to MERV 8 performance Typically ½”, 1”, and 2” Depth

HVAC Filter Styles Extended Surface Filters Poly Cube Pleat Pocket Rigid Aluminum Separator Cell, HEPA Minipleat Panel, V-Bank MERV 6 and better performance Typically 1”, 2”, 4”, 6”, and 12” Depth

HVAC Filter Styles Extended Surface Filters Carbon Honeycomb Panel Carbon V-Bank Carbon Housing Pleated Carbon Nonwoven

Non HVAC Filter Styles Extended Surface Filters Cleanroom Panel Dust and Liquid Bag Pleated Bag Cartridge

Sample Calculation Ring Panel Duct Velocity Duct Area Air Flow 500 feet per minute Duct Area 2’ x 2’ = 4 sq feet Air Flow 500 * 4 = 2000 cfm Media Area Media Velocity 2000 cfm / 4 sq feet = 500 feet per minute = Duct Velocity

Sample Calculation Pleated Filter Duct Velocity Duct Area Air Flow 500 feet per minute Duct Area 2’ x 2’ = 4 sq feet Air Flow 500 * 4 = 2000 cfm Media Area 2’ x 2’ x ?” = ?? sq feet Media Velocity 2000 cfm / ?? sq feet = ???

Pleated Filters Contractor Pleat Standard Capacity High Capacity 1” Nominal ¾” Actual 1.00 pleat per inch 1.33 pleats per inch 2” Nominal 1 ¾” Actual 0.80 pleats per inch 1.25 pleats per inch 4” Nominal 3 5/8” Actual 0.75 pleats per inch

Pleated Filters Contractor Pleat Standard Capacity High Capacity 1” Nominal ¾” Actual 1.00 pleat per inch 1.33 pleats per inch 2” Nominal 1 ¾” Actual 0.80 pleats per inch 1.25 pleats per inch 4” Nominal 3 5/8” Actual 0.75 pleats per inch

Pleated Filter 24” Wide * 0.80 ppi = 19 Pleats

Pleated Filter 24” Wide * 0.80 ppi = 19 pleats 24” Tall * 70.7” Wide = 1,697 sq inches / 144 sq in / sf = 11.8 sq feet of media 1 ¼” 0.625” 1 ¾” 1.86”

Pleated Filters Contractor Pleat Standard Capacity High Capacity 1” Nominal ¾” Actual 1.00 pleat per inch 1.33 pleats per inch 2” Nominal 1 ¾” Actual 0.80 pleats per inch 11.8 sq feet 1.25 pleats per inch 4” Nominal 3 5/8” Actual 0.75 pleats per inch

Pleated Filters Contractor Pleat Standard Capacity High Capacity 1” Nominal ¾” Actual 1.00 pleat per inch 1.33 pleats per inch 2” Nominal 1 ¾” Actual 0.80 pleats per inch 11.8 sq feet 1.25 pleats per inch 4” Nominal 3 5/8” Actual 0.75 pleats per inch

Sample Calculation Pleated Filter Duct Velocity Duct Area Air Flow 500 feet per minute Duct Area 2’ x 2’ = 4 sq feet Air Flow 500 * 4 = 2000 cu ft / min Media Area 2’ x 2’ x 2” = 11.8 sq feet Media Velocity 2000 cfm / 11.8 sq feet = 169 feet per minute

Unaccounted Losses Actual Dimensions Blinding Turbulent Flow 23 3/8” x 23 3/8” = 3.8 sq ft = 5% loss Blinding Welded Wire – xx% Paper Die Cut – xx% Turbulent Flow 11.8 sq feet becomes 11.5 sq feet 169 feet per minute becomes

Pocket Filters 24” x 24” x 22” 5 Pocket 24” x 24” x 12” 10 Pocket Each Pocket 24 H * 22 D * 2 = 528 sq in = 3.7 sq ft Whole Filter 3.7 sq ft * 5 = 18.5 sq ft Media Velocity 2000 cfm / 18.5 sf = 108 fpm 24” x 24” x 12” 10 Pocket Each Pocket 24 H * 12 D * 2 = 288 sq in = 2 sq ft Whole Filter 2 sq ft * 10 = 20 sq ft Media Velocity 2000 cfm / 20 sf = 100 fpm