11_1/2x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack flowering nutrients they are safe to use

they are safe to use in your conventional oven

Its stackable components offer safe

- 24" filter bed

Operating temperature can be set between 32 to 140 degrees Fahrenheit

ventilation for at least 2 to 5 minutes is mandatory to replenish the oxygen supply required by the generator's combustion

11_1/2x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack flowering nutrients they are safe to useNordic Pure Custom MERV 13 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