Description
Product Overview
The HFAS20 is a custom make-to-order 2-Inch washable MERV 4 foam air filter manufactured to your specified height and width dimensions. Engineered for permanent installation in HVAC systems, electronics cooling, and light industrial ventilation applications where standard catalog sizes do not fit, the HFAS20 delivers the same HF Series two-stage progressive density filtration performance as catalog HFA products—built to the exact height and width you specify. As a custom order, the HFAS20 requires customer-provided dimensions at time of order; contact Metal Air Filters with your required height and width to request a quote and lead time.
Constructed with a precision-formed .030” thick aluminum frame with mitered corners, pop-rivet construction, and drain holes in three corners, and a two-stage media pack combining stage 1 aluminum mesh foam prefilter (expanded aluminum grid plus corrugated screen wire criss-cross) with stage 2 25 ppi open-cell polyurethane foam air filter media backed by an expanded aluminum exit support grid, the HFAS20 delivers 85.4% at rated airflow (300 fpm) dust arrestance efficiency with 27 grams per square foot dust holding capacity at rated 300 fpm at rated 300 fpm airflow. Height and width are fabricated to your specified dimensions with ±1/8” tolerance. The nominal 2” depth produces an actual depth of 1-3/4″ per HF Series manufacturing convention.
Two important care requirements specific to the HF Series MERV 4 foam air filter: do NOT coat the HFAS20 with any adhesive—the manufacturer specifically states that adhesive coating is not advisable for this filter type. Do NOT expose the HFAS20 to direct sunlight or ultraviolet light—UV exposure degrades the polyurethane foam media over time. Installation is flexible: the filter may be mounted vertically or horizontally with no required directional orientation. Contact Metal Air Filters to place a custom order: provide your required height, width, and quantity.
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Key Benefits of the HFAS20 Custom MERV 4 Foam Air Filter
- Made to Your Dimensions: Fabricated to the exact height and width you specify—ideal for non-standard housing sizes, retrofit HVAC applications, and electronic equipment enclosures where off-the-shelf catalog sizes do not fit. Provide your required dimensions when ordering and receive a precision-built filter with ±1/8” dimensional tolerance
- MERV 4 Rated — Two-Stage MERV 4 dust filtration foam filter: Same two-stage progressive density media as catalog HFA products: stage 1 aluminum mesh foam prefilter prefilter captures large particles, stage 2 25 ppi open-cell polyurethane foam captures fine particles, together delivering MERV 4 efficiency at low air resistance suitable for electronics, HVAC, and machinery ventilation foam air filter
- Low Air Resistance — Suitable for Electronics: The HF Series MERV 4 foam air filter maintains low static pressure drop at rated 300 fpm, making the HFAS20 appropriate for electronics cooling, computer rooms, and other airflow-sensitive applications where excessive filter resistance would reduce cooling effectiveness
- Permanent washable MERV 4 foam filter design: Rinse with warm water to restore full MERV 4 filtration performance—no replacement media required. Eliminates recurring disposable filter cost for non-standard sizes that may be difficult to source as disposables
- 250°F Maximum Operating Temperature: Rated for continuous operation at temperatures up to 250°F, suitable for commercial air handlers, light industrial ventilation, and HVAC applications with elevated supply air temperatures
- All-Aluminum Frame Construction: .030” thick aluminum frame with precision-mitered corners and pop-rivet construction fabricated to your specified height and width, with drain holes in three corners for frame drainage
- Flexible Installation — Vertical or Horizontal: No orientation restriction—install the HFAS20 vertically or horizontally to suit your housing configuration
- Made in USA by AMFCO — UL Classified 900: Manufactured by American Metal Filter Company to the same construction standards as catalog HFA products
Technical Specifications
The HFAS20 custom 2-Inch MERV 4 washable MERV 4 foam air filter is built to customer-specified dimensions using the same HF Series construction and materials as catalog HFA products. All performance specifications conform to the AMFCO HF Series tech sheet. Height and width are provided at time of order.
| Specifications: | Details: |
|---|---|
| Model Number | HFAS20 (HF Series — Custom Make-to-Order MERV 4 Foam Air Filter) |
| Ordered Size (Custom) | Customer-specified H” × Customer-specified W” × 2” D — provide dimensions when ordering |
| Actual Depth | 1-3/4″ (±1/16”) — height and width fabricated to customer spec (±1/8”) |
| Frame Material | .030” thick aluminum |
| Frame Construction | Precision-mitered corners secured with pop rivets; drain holes in three corners |
| Stage 1 Media | Expanded aluminum grid (corrugated) + corrugated aluminum screen wire (criss-cross) |
| Stage 2 Media | 25 ppi open-cell polyurethane filter foam (±5 ppi) |
| Exit Support Grid | Expanded aluminum support grid on air-exit side |
| Filter Type | Two-stage impingement type washable foam and aluminum panel filter — custom make-to-order |
| MERV Rating | MERV 4 |
| Dust Arrestance | 85.4% at rated airflow (300 fpm) (ASHRAE 52.1) |
| Dust Holding Capacity | 27 grams per square foot |
| Rated Airflow | 300 fpm face velocity |
| Recommended Airflow Range | 250–350 fpm |
| Maximum Operating Temperature | 250°F continuous |
| Recommended Final Resistance | 0.50 inches W.G. before cleaning |
| Cleaning Method | Rinse with moderate-to-heavy stream of warm water; air dry before reinstalling |
| Adhesive Coating | NOT advisable — do not coat this filter with any adhesive |
| UV / Sunlight Warning | DO NOT place in direct sunlight or UV light — degrades polyurethane foam media |
| Installation Orientation | Vertical or horizontal — no orientation restriction |
| Washability | Frequent and moderate |
| Filter Weight | Varies by ordered dimensions |
| Compliance & Certifications | UL Classified 900 |
| UPC Code | 840373527441 |
| GTIN Code | 00840373527441 |
| Country of Origin | Made in USA |
How to Order Your Custom 2-Inch washable MERV 4 foam air filter
The HFAS20 is a make-to-order product. Because height and width are built to your specifications, please contact Metal Air Filters before placing your order to confirm your required dimensions, lead time, and pricing. Having the following information ready will ensure a fast, accurate quote:
- Required Height: The actual height of the filter you need (in inches, to the nearest 1/8”).
- Required Width: The actual width of the filter you need (in inches, to the nearest 1/8”).
- Quantity: The number of filters required. Custom orders may have minimum quantity requirements—confirm with Metal Air Filters.
- Application: Brief description of your application (electronics cooling, HVAC, machinery ventilation, etc.) to help confirm the right specification.
- Installation Environment: Confirm the filter will not be exposed to direct sunlight or UV light in the installation location.
Once your order is confirmed and dimensions verified, production and shipping lead time will be quoted. Custom filters are built to order and cannot be returned or exchanged, so confirming your housing dimensions before ordering is essential. Contact Metal Air Filters by phone or email to place your custom HFAS20 order.
Applications
The HFAS20 custom 2-Inch MERV 4 foam air filter is specified for commercial, residential, electronics, and light industrial HVAC applications where standard catalog HFA filter sizes do not match the required housing dimensions. The make-to-order capability allows engineers and facilities managers to specify precise filter dimensions for retrofit projects, non-standard ductwork, existing housings with unusual dimensions, and electronic equipment enclosures requiring exact sizing.
Non-Standard Housing Retrofit Applications
Buildings with HVAC systems installed with non-standard filter housing dimensions that do not match current catalog sizes frequently require custom-dimensioned filters. The HFAS20 provides the same HF Series two-stage MERV 4 filtration in a filter built to the exact dimensions required for proper fitment in these non-standard housings, eliminating bypass gaps that reduce filtration efficiency.
Electronics and Equipment Cooling
Electronic equipment enclosures, server room air conditioning units, and precision cooling systems frequently have non-standard filter section dimensions. The HFAS20 custom filter provides MERV 4 efficiency at low static resistance in a 2-Inch MERV 4 foam air filter built to the exact dimensions of your equipment, with no UV exposure at the filter location.
Machinery Ventilation
Industrial machinery ventilation systems with ductwork fabricated to plant-specific dimensions require custom filter sizing. The HFAS20’s aluminum mesh and foam construction captures industrial dust and particulate in custom-dimensioned filters that fit precisely in machinery ventilation housings without air bypass.
Maintenance & Cleaning
The HFAS20 custom washable MERV 4 foam air filter uses identical washing procedures as catalog HFA products. Remove the filter and rinse with a moderate-to-heavy stream of warm water from the clean side through to the dirty side until water runs completely clear. High-powered steam cleaning and chemical dips are not recommended. Air dry or shake off excess water before reinstalling. Do NOT apply adhesive coating after washing or at any time. Do NOT expose to UV/sunlight during storage or installation—UV degrades the polyurethane foam media.
Frequently Asked Questions
What dimensions can I specify for the HFAS20?
Height and width can be specified to your exact requirements in 1/8” increments. The nominal depth is fixed at 2” (1-3/4″ actual depth per HF Series manufacturing convention). Contact Metal Air Filters with your required height and width to receive a quote and confirm lead time before placing your custom order.
How does the HFAS20 two-stage MERV 4 foam air filter work?
Stage 1 aluminum mesh (expanded aluminum grid plus corrugated screen wire criss-cross) captures large airborne particles. Stage 2 25 ppi open-cell polyurethane foam captures finer particles. This progressive density approach provides MERV 4 efficiency at low static resistance suitable for electronics and HVAC applications.
Can I apply adhesive coating to the HFAS20?
No. AMFCO explicitly states that coating the HF Series filter with any adhesive is not advisable. The two-stage foam and aluminum mesh construction provides effective mechanical particulate capture without adhesive.
Can the HFAS20 be exposed to sunlight?
No. DO NOT place the filter in direct sunlight or UV light. UV radiation degrades the polyurethane foam media over time. Store and install away from UV sources.
What is the lead time for a custom HFAS20 order?
Lead time varies by dimensions and production schedule. Contact Metal Air Filters with your required dimensions and quantity to receive a current lead time quote. Custom orders cannot be returned or exchanged once production has begun.
What is the maximum operating temperature?
250°F continuous. For higher-temperature applications, consider the HM Series stainless steel (HMS) mist eliminators (900°F) though those are moisture separators, not dust filters.
Can the HFAS20 be installed vertically or horizontally?
Yes — no orientation restriction. The HFAS20 delivers full MERV 4 filtration performance in either vertical or horizontal mounting.
How often should I wash the HFAS20?
General HVAC: every 1–3 months. Electronics/computer room: every 3–6 months. Industrial/machinery ventilation: monthly or as needed. Inspect visually and wash when loaded.
Why Choose the HFAS20 Custom MERV 4 Foam Air Filter?
The HFAS20 custom HF Series MERV 4 foam air filter solves the critical problem of non-standard housing sizes where catalog filter dimensions do not fit. With MERV 4 two-stage progressive density efficiency, low air resistance for electronics applications, and 250°F temperature capability, the HFAS20 delivers permanent washable MERV 4 particulate protection built to your exact height and width requirements. Warm-water washing restores full performance without replacement media cost or special cleaning agents. Made in USA by American Metal Filter Company to the same standards as catalog HFA products.
Remember the two absolute care rules for all HF Series foam filters: no adhesive coating (specifically contraindicated) and no UV/sunlight exposure (degrades foam). Install away from UV sources and wash periodically with warm water for lasting performance throughout years of HVAC service. Contact Metal Air Filters to place your custom HFAS20 order with your required height, width, and quantity.
