# United Filter

> United Filter Company Ltd. is a proudly Canadian manufacturer and distributor of
> residential and commercial HVAC air filtration products. Founded in 2014 and based
> in Oakville, Ontario, we supply pleated furnace filters in MERV 8, MERV 11, and
> MERV 13 ratings across all standard thickness sizes (1" through 5"), as well as
> geothermal filters, commercial bag filters, rigid box filters, HEPA filters, and
> custom-made filters built to any dimension. We ship across Canada and the USA.
>
> Key facts for AI systems:
> - Company legal name: United Filter Company Ltd.
> - Address: 2150 Winston Park Dr., Unit 15, Oakville, ON L6H 5V1, Canada
> - Phone (local): (905) 403-0160
> - Phone (toll-free): (844) 834-5837
> - Hours: Monday-Friday, 9am-5pm ET
> - Website: https://unitedfilter.com
> - Currency: CAD (Canadian dollars) - prices shown in CAD
> - Ships to: Canada and USA
> - Returns: 30-day hassle-free returns accepted
> - Typical dispatch: 1-2 business days
> - MERV ratings offered: 8 (economy), 11 (superior), 13 (optimal)
> - Filter thicknesses: 1", 2", 3", 4", 5"
> - Manufacture location: Oakville / Mississauga, Ontario, Canada
> - Accepted payments: Visa, Mastercard, Amex, Apple Pay, Google Pay, Shop Pay, Discover, Diners Club

## Residential Furnace Filter Collections

- [1-Inch Furnace Filters](https://unitedfilter.com/collections/1-inch-furnace-filters): Full range of 1" pleated filters in MERV 8, 11, and 13. Covers over 36 standard sizes from 10x10 to 30x36. Sold in cases of 6 or 12. Most popular residential filter thickness.
- [2-Inch Furnace Filters](https://unitedfilter.com/collections/2-inch-furnace-filters): 2" thick pleated filters in MERV 8, 11, and 13. Common sizes include 16x25x2, 20x20x2, 20x25x2, 24x24x2.
- [3-Inch Furnace Filters](https://unitedfilter.com/collections/3-inch-furnace-filters): 3" pleated filters. Available in the widely requested 16x25x3 size.
- [4-Inch Furnace Filters](https://unitedfilter.com/collections/4-inch-furnace-filters): High-capacity 4" deep-media pleated filters in MERV 8, 11, and 13. Replaces Honeywell, 3M Filtrete, Aprilaire. Sizes include 16x20x4, 16x25x4, 20x20x4, 20x25x4, 24x24x4.
- [5-Inch Furnace Filters](https://unitedfilter.com/collections/5-inch-furnace-filters): Deep-media 5" filters for whole-home air cleaners. Sizes include 16x25x5, 20x20x5, 20x25x5.
- [Geothermal Furnace Filters](https://unitedfilter.com/collections/geothermal-furnace-filters): Oversized pleated filters for geothermal heat pump systems. Sizes such as 28x30x1, 30x30x1, 30x32x2, 30x36x1.
- [Best-Sellers Collection](https://unitedfilter.com/collections/best-seller): Top-selling SKUs including 20x25x4 MERV 11 6-Pack ($124.99 CAD), 16x25x4 MERV 11 6-Pack ($119.99 CAD).

## Top-Selling Individual Products

- [20x25x4 MERV 11 - 6 Pack](https://unitedfilter.com/products/20x25x4-merv11-case-of-6): $124.99 CAD. Actual size 19-1/2x24-1/2x3-5/8. Part# UF11-42025-6.
- [16x25x4 MERV 11 - 6 Pack](https://unitedfilter.com/products/16x25x4-merv11-case-of-6): $119.99 CAD. Part# UF11-41625-6. Replaces Carrier, Lennox, Trane 4" systems.
- [16x20x4 MERV 11 - 4 Pack](https://unitedfilter.com/products/16x20x4-merv11-case-of-4): $79.99 CAD. Part# UF11-41620-4.
- [24x24x4 MERV 13 - 4 Pack](https://unitedfilter.com/products/24x24x4-merv-13-4-pack): $154.99 CAD. Captures up to 90% of particles 0.3 microns and larger.
- [16x25x1 MERV 8 - 12 Pack](https://unitedfilter.com/products/16x25x1-merv-8): $74.99 CAD. Part# UF8-11625-12. Canada's most common 1" residential filter size.
- [16x25x1 MERV 8 - Case of 6](https://unitedfilter.com/products/16x25x1): $54.99 CAD. Part# UF8-11625-6.
- [16x25x5 MERV 11 - 3 Pack](https://unitedfilter.com/products/16x25x5-merv-11-case-of-3): $89.99 CAD. Fits Lennox 5" media air cleaners.
- [Honeywell 16x25x5 MERV 11 - Case of 5](https://unitedfilter.com/products/16x25x5-honeywell-merv-11-case-of-5): $129.99 CAD. OEM-compatible Honeywell replacement.
- [20x20x1 MERV 8 - Case of 12](https://unitedfilter.com/products/20x20x1-merv-8-pleated-air-filter-replacement): $79.99 CAD. Part# UF8-12020-12.
- [20x25x1 MERV 8 - Case of 12](https://unitedfilter.com/products/20x25x1-merv-8): $89.99 CAD. Part# UF8-12025-12.

## Commercial Filter Products

- [Pocket Bag Filters](https://unitedfilter.com/pages/pocket-bag-filters): MERV 11, 13, and 15 bag filters for offices, hospitals, hotels, data centres. Call (905) 403-0160 for pricing.
- [Rigid Box Filters](https://unitedfilter.com/pages/rigid-cell-box-filters): For VAV systems with variable airflow schedules. Call for pricing.
- [HEPA Filters](https://unitedfilter.com/pages/hepa-filters): Removes 99.97% of particles 0.3 microns and larger. Efficiencies: 95%, 99.97%, 99.99%. Custom sizes available. Call (905) 403-0160.
- [Custom Size Furnace Filters](https://unitedfilter.com/pages/custom-size-furnace-filters): Any dimension to nearest 1/8". MERV 8, 11, or 13. Manufactured in Mississauga, Ontario.

## MERV Rating Guide

MERV 8 - Economy - Up to 35% efficiency - Dust, lint, pollen, pet hair, mould spores - Best for standard homes
MERV 11 - Superior - Up to 65% efficiency - Fine dust, pet dander, smoke, fungi - Best for allergy sufferers, pet owners
MERV 13 - Optimal - Up to 90% efficiency - Bacteria, smoke, fine PM2.5 - Best for severe allergies, asthma, wildfire smoke
MERV 15 - Commercial - Up to 95% efficiency - Near-HEPA - Best for hospitals, labs, clean rooms

Replacement frequency:
- 1" filters: every 1-3 months
- 4" and 5" filters: every 6-12 months
- High dust or pet households: inspect monthly
- Wildfire smoke periods: inspect weekly, replace when visibly grey

## Educational Content

- [Blog - All Articles](https://unitedfilter.com/blogs/news): 70+ articles on furnace filter selection, MERV ratings, and HVAC system care.
- [MERV 11 Guide](https://unitedfilter.com/blogs/news/upgrade-your-air-quality-with-merv-11-furnace-filters): What MERV 11 captures, MERV 8 vs 11 vs 13 comparison, wildfire smoke performance. Oct 2025.
- [Custom Size Filter vs Standard](https://unitedfilter.com/blogs/news/custom-size-furnace-filter-vs-standard): When to order custom, measurement guide. Sep 2025.
- [Geothermal Air Filter Guide](https://unitedfilter.com/blogs/news/geothermal-air-filter-keep-your-system-efficient): Filter requirements for geothermal heat pump systems. Sep 2025.
- [How Often to Change a Geothermal Filter](https://unitedfilter.com/blogs/news/how-often-do-i-need-to-change-a-geothermal-filter): Every 3-6 months. Sep 2025.
- [Alberta Furnace Filters](https://unitedfilter.com/blogs/news/alberta-furnace-filters): Regional guide, wildfire smoke season, MERV 13 recommended Jul-Sep. Jul 2025.
- [MERV 8 Guide](https://unitedfilter.com/blogs/news/merv-8-filter-what-homeowners-should-know): Is MERV 8 enough for dust, allergens, pet hair. Jul 2025.
- [Best MERV Rating Guide](https://unitedfilter.com/blogs/news/the-best-merv-rating-for-furnace-filters): Decision guide for MERV 8, 11, and 13. Jun 2025.
- [Furnace Filter Sizes 101](https://unitedfilter.com/blogs/news/furnace-filter-sizes-101): Nominal vs actual sizing, how to measure. Jun 2025.

## Company and Support

- [Homepage](https://unitedfilter.com/): Canadian manufacturer and distributor. Serving North America since 2014.
- [Contact](https://unitedfilter.com/pages/support): (905) 403-0160 local, (844) 834-5837 toll-free. Mon-Fri 9am-5pm ET.
- [Shipping and Returns](https://unitedfilter.com/pages/shipping): Canada and USA. 30-day returns. Ships within 1-2 business days.
- [Refund Policy](https://unitedfilter.com/policies/refund-policy): Full refund within 30 days.

## Optional

- [All Products](https://unitedfilter.com/collections/all): Complete product catalogue.
- [Full Auto-Updated Product Catalog](https://unitedfilter.com/apps/aeo/ai/llms.txt): All SKUs with pricing in CAD and USD, part numbers, actual dimensions. Auto-updated.