Air Filters Renfrew
Furnace, heat pump and commercial HVAC filters for Renfrew's heritage homes, new builds, health care facilities and businesses – manufactured in Brampton and shipped to your door.
- ✓ Made in Canada
- ✓ Custom sizes
- ✓ MERV 8 · 11 · 13
- ✓ No customs or duties
Air quality in Renfrew
Renfrew is built on the Bonnechere River, with its downtown along Raglan Street and the historic Swinging Bridge and McDougall Mill marking the river's path through town. The valley setting is beautiful, but it means cold air and smoke can pool along the river on winter mornings, especially when wood stoves and fireplaces are burning throughout town and on the surrounding farms.
Spring and summer bring pollen from the maple, birch and poplar that line Renfrew's older streets and the woodlots beyond, followed by grass pollen and ragweed in August. Farm fields in neighbouring Horton and Admaston/Bromley add dust at planting and harvest, and Highway 17 traffic adds a steady stream of truck exhaust along the town's edge.
Like the rest of Renfrew County, the town has felt the effects of wildfire smoke. The June 2023 Quebec wildfires left Renfrew under a thick haze for days, with outdoor air quality warnings across the Ottawa Valley. A pleated MERV 13 filter, with your windows closed and furnace fan running, captures a large share of the fine smoke particles that enter your home.
Renfrew climate, homes & HVAC systems
Renfrew winters are long and cold, with frequent stretches below -20°C and occasional cold snaps near -35°C, plus plenty of snow. Summers are warm and can be humid, especially in July. The furnace runs from October well into May, and homes with central air or heat pumps keep the blower going through the summer too.
The town's housing includes brick and frame homes from the late 1800s and early 1900s near downtown, post-war bungalows and split-levels, newer subdivisions on the edges of town, and a growing number of apartments and seniors' residences. Most in-town homes heat with natural gas forced air, while properties outside town rely on propane, oil, wood or heat pumps. Older homes usually have 1-inch filter slots; newer furnaces often have 4- or 5-inch media cabinets.
MERV 11 through the long winter, MERV 13 for smoke and allergies
MERV 11 handles winter dust, wood smoke drift and pet dander for most Renfrew homes. Choose MERV 13 during wildfire smoke or for households with asthma, allergies, newborns or seniors.
Shop MERV 11 → Shop MERV 13 →Seasonal filter tips for Renfrew
- Spring: Replace the filter in April after the long heating season – it has likely worked for months.
- Summer: Keep a spare MERV 13 filter on hand for smoke advisories coming in from Quebec or Northern Ontario.
- Fall: Install a fresh filter before the Renfrew Fair wraps up and the first frost sets in.
- Winter: Check monthly – deep cold keeps the furnace fan running for hours at a time.
Which MERV rating is right for your Renfrew home?
MERV (Minimum Efficiency Reporting Value) measures how well a filter captures particles of different sizes under the ASHRAE 52.2 test standard. Higher numbers catch smaller particles. Most residential furnaces in Canada run well on MERV 8 to MERV 13 – here is how to choose:
| Rating | What it captures | Best for |
|---|---|---|
| MERV 8 | Dust, lint, pollen, mould spores and larger particles (3–10 microns) | Budget-friendly everyday protection, rental units, new-build dust |
| MERV 11 | Everything MERV 8 does plus pet dander, fine dust and some smoke (1–3 microns) | Most family homes, pets, seasonal allergies |
| MERV 13 | Fine particles down to 0.3–1 micron, including much of the PM2.5 in wildfire smoke | Asthma, allergies, wildfire smoke, newborns and seniors |
Not sure? Read our complete MERV rating guide. If you are moving up to MERV 13 on an older furnace, a deeper 2-inch or 4-inch filter keeps airflow healthy.
Popular furnace filter sizes in Renfrew
Older Renfrew homes typically use 1-inch filters like 16x25x1 and 20x25x1, while newer gas furnaces often have 4-inch filters. Seniors' apartments and older heritage homes sometimes need odd sizes – see our special sizes.
How often to change your furnace filter in Renfrew
| Filter depth | Typical home | Pets, allergies or smoke |
|---|---|---|
| 1-inch | Every 1–3 months | Every 30–45 days |
| 2-inch | Every 3–4 months | Every 2 months |
| 4-inch | Every 6–9 months | Every 4–6 months |
| 5-inch | Every 9–12 months | Every 6 months |
Renfrew's long heating season means a 1-inch filter installed in October usually needs replacing by December and again by February. See the full filter changing guide.
Air filters for Renfrew businesses & property managers
Renfrew is a service centre for the surrounding valley, with Renfrew Victoria Hospital, long-term care and seniors' residences, schools, manufacturers, municipal buildings and a busy retail strip. Health care and seniors' facilities in particular depend on clean filters to protect vulnerable residents.
We supply hospitals, long-term care homes, schools, manufacturers, property managers and HVAC contractors in Renfrew with pleated, pocket, rigid cell, V-bank and HEPA filters in bulk, with volume pricing and scheduled deliveries for approved accounts.
- Pleated filters in 1", 2" and 4" depths, MERV 8–13
- Pocket (bag) filters, rigid cell and V-bank filters for rooftop units and air handlers
- Wire panel, HEPA, carbon and media pads & rolls
- Volume pricing, scheduled deliveries and NET terms for approved business accounts
Shipping & delivery to Renfrew
Orders to Renfrew ship for a $25 flat rate, and orders of $2,500 or more ship free. Most orders arrive in 3–9 business days.
Standard sizes are usually made and shipped within 1–2 weeks; custom sizes can take up to 3 weeks. Prefer to collect? Free pickup is available Monday to Friday, 7:00 AM – 4:30 PM at 15 Melanie Drive, Brampton. Full details are on our shipping & returns page.
Why Renfrew customers choose Canadian Air Filters
Areas we deliver to in Renfrew
Downtown Renfrew · Raglan Street · Swinging Bridge area · Bonnechere River area · Renfrew Fairgrounds area · Horton · Admaston · Douglas · Castleford · Burnstown · Calabogie · Haley Station · Cobden
Nearby location pages: Ottawa, Clarence-Rockland, Russell Township, North Grenville (Kemptville), Merrickville-Wolford, Beckwith Township, Carleton Place, Mississippi Mills (Almonte), Montague Township, McNab/Braeside, Arnprior, Horton Township, Whitewater Region, Laurentian Valley, Pembroke, Smiths Falls, Perth, Drummond/North Elmsley. Or see all locations we deliver to.
Renfrew air filter FAQ
What MERV rating should I use in Renfrew?
MERV 11 is a strong choice for most Renfrew homes. Use MERV 13 for wildfire smoke, asthma or allergies, and make sure you change it on time.
How often should I change my furnace filter in a Renfrew winter?
Check a 1-inch filter monthly in winter and replace it every one to two months. Deeper 4- or 5-inch filters usually last six months or more.
Does wood smoke from neighbours get into my home?
Yes, especially on cold, still mornings when smoke settles in the Bonnechere valley. A pleated MERV 11 or MERV 13 filter captures much of the fine particulate once it is inside.
Do you supply filters to Renfrew health care and seniors' facilities?
Yes. We supply pleated, pocket, rigid cell and HEPA filters in bulk. Visit our bulk orders page to set up an account.
My older Renfrew home has an unusual filter size – can you help?
Yes. Measure the old filter or read the printed size and search our site. If we don't have it in stock, we can make it in our Brampton factory.
Will a better filter help during wildfire smoke?
Yes. With windows closed and the furnace fan on, a MERV 13 filter removes a large share of smoke particles from indoor air.
How much does shipping to Renfrew cost?
Orders to Renfrew ship for a $25 flat rate, and orders of $2,500 or more ship free. Most orders arrive in 3–9 business days.
Can you make custom-size filters for my Renfrew home or building?
Yes. Because we manufacture in Brampton, we can build non-standard and custom sizes to order – usually within about 3 weeks. Use our custom filter form or email info@canadianairfilters.com with your dimensions and MERV rating.
Helpful air quality guides
Ready to breathe better in Renfrew?
Made in Brampton · $25 flat rate · standard & custom sizes.