Currently Canadian tire and Walmart carry MERV 5 and sometimes MERV 2
Canadian tire carrys fiberglass media in a 50 ft roll that can be cut down to size so they'll fit your hammock.
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Important ....regardless of what your told is change filters monthy on all furnaces .
If you cannot afford to change them monthly blow them off with a compressor, leaf or snowblower so they can be used easily again.
Once they start changing color then throw them away.
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