PureFilters 18x18x4 pleated furnace air filters are manufactured in Canada using only the highest quality materials. We offer the 18x18x4 furnace filter in different MERV ratings so you can choose the one that is best for your home environment. We stand behind all of our furnace filters, meaning if you are not happy with our product, we will take it back and refund you in full, no questions asked. Our superior filters, outstanding customer service and fast delivery has made PureFilters become the #1 furnace filter supplier in Canada.

NOTE: This is considered a custom size, there are no refunds/returns for this item. Please measure and confirm your filter size before purchasing. Custom sized filters may take up to 8-10 weeks for delivery.

From hassle free returns, to instant responses via chat/phone/email, our PureFilters team goes above the call of duty to keep your air fresh without the stress. Be sure to check out the PureFilters Blog - Use Tips and Information On Indoor Air Quality

Indoor air quality is essential to our well being, and Canadians deserve a company that just gets it right. PureFilters was founded with a mission of making superior indoor air quality simple and affordable. Our cutting edge high capacity pleat technology is designed to catch as many particles as possible, without restricting air flow.