25x28x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack Reflective & Greenhouse Films 6mm inlet- 4 larger holes

6mm inlet- 4 larger holes than 1

Do not mix with salt-based or high alkal reaction products

They are available in both 120V and 230V configurations to match most commercial and industrial electrical setups

the Pro Hammerhead Unit is made from highly reflective hammertone aluminum and is compatible with all single-ended lamps up to 1000W

Not all meters will read identically

25x28x1 MERV 7 Plus Carbon AC Furnace Filters 6 Pack Reflective & Greenhouse Films 6mm inlet- 4 larger holesNordic Pure Custom MERV 7 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition