Air Filters Markham

Air quality in Markham

• Highway 404, 407 & 7 traffic
• New subdivision construction
• Rouge Valley tree pollen
• Farmland dust & ragweed
• Busy multigenerational homes
• Wildfire smoke

Markham sits where Highway 404 meets the 407, and the Highway 7 corridor through the city is lined with tech offices, business parks and busy plazas. Downtown Markham and the newer communities of Cornell, Wismer, Berczy Village and Cathedraltown have grown quickly, so new construction, road widening and transit work have been a fact of life in many parts of the city. Rush-hour traffic on the 404 and Highway 7 adds exhaust and fine road dust, especially in neighbourhoods close to the main corridors.

The east side borders Rouge National Urban Park and the Rouge River valley, and the north still opens onto farmland toward Stouffville and Victoria Square. That means heavy spring tree pollen from maples, oaks and birches, grass pollen in June and a strong ragweed season from August into September. Hot, humid summer days can trap ozone and fine particles, and wildfire smoke from northern Ontario and Quebec has drifted over Markham several times in recent years.

Indoors, many Markham homes are busy multigenerational households, with grandparents, parents and children under one roof. More people means more cooking, more dust and more time with the furnace fan running – and seniors and young children are the ones who benefit most from cleaner indoor air. Our guide to indoor air for kids and seniors covers a few simple steps.

Markham climate, homes & HVAC systems

Markham has the typical inland GTA climate: cold, snowy winters that keep furnaces running from November through March, and warm, humid summers when central air works hard from June to September. Spring and fall bring a short break, but with heating and cooling stretching across most of the year, filters are working nearly all the time.

Housing ranges widely. Unionville and Markham Village have heritage homes and older houses where ductwork and filter slots may be original, while Milliken, Thornhill and Markham's 1970s–1990s subdivisions mostly take standard 1-inch filters. The large newer homes in Angus Glen, Cathedraltown and Berczy Village often have high-efficiency furnaces with 4- or 5-inch media cabinets and HRVs, and the condo towers around Downtown Markham use fan coils or in-suite heat pumps.

Which MERV rating is right for your Markham 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:

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 Markham

These cover most Markham furnaces, from 1980s Milliken homes to new builds in Cathedraltown. Older or unusual systems, and condo fan coils, may need a special size – we make those in-house.

How often to change your furnace filter in Markham

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

In Markham, larger multigenerational households and homes with pets should check 1-inch filters monthly, and swap again in late summer if ragweed allergies flare. See the full filter changing guide.

Air filters for Markham businesses & property managers

Markham calls itself Canada's high-tech capital, and the Highway 7 and 404 corridors are home to hundreds of technology, finance and life-science offices. Add Markham Stouffville Hospital, long-term care and retirement homes, schools, places of worship, busy plazas and restaurants, and the city runs a lot of commercial HVAC equipment.

We supply Markham property managers, facility teams and HVAC contractors with pleated, pocket, rigid cell and V-bank filters in bulk, delivered free across the GTA. Need recurring deliveries for multiple plazas or office buildings? Set up a business account and we will have the right sizes ready for every change cycle.

• 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 Markham

Markham is inside our free delivery zone (within 60 km of our Brampton facility). Choose “Free GTA Delivery” at checkout, or pick up free at 15 Melanie Drive, Brampton.

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.

Areas we deliver to in Markham

Unionville · Markham Village · Downtown Markham · Cornell · Berczy Village · Wismer · Cathedraltown · Angus Glen · Milliken · Thornhill · Cachet · Greensborough · Box Grove · Armadale · Victoria Square · Buttonville · Raymerville · Legacy

Nearby location pages: York Region, Vaughan, Richmond Hill, Newmarket, Aurora, King Township, Whitchurch-Stouffville, East Gwillimbury, Georgina. Or see all locations we deliver to.

Markham air filter FAQ

Helpful air quality guides