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HVAC Filter Styles and Calculations for Improved Air Quality

Explore different HVAC filter styles and how to calculate air velocity and media area for optimal performance and air quality in HVAC systems. Learn about panel, extended surface, pleated, and pocket filters.

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HVAC Filter Styles and Calculations for Improved Air Quality

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  1. Media VelocityPanel vs Extended Surface NAFA Technical Seminar May 2004

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

  3. 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

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

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

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

  7. Sample Calculation Pleated Filter • Duct Velocity 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 = ???

  8. Pleated Filters

  9. Pleated Filters

  10. Pleated Filter 24” Wide * 0.80 ppi = 19 Pleats

  11. Pleated Filter 24” Wide * 0.80 ppi = 19 pleats 19 Pleats * ( 2 * 1.86”) = 70.7” 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”

  12. Pleated Filters

  13. Pleated Filters

  14. Sample Calculation Pleated Filter • Duct Velocity 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

  15. Unaccounted Losses • Actual Dimensions • 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

  16. 24” x 24” x 22” 5 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 Pocket Filters

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