20x26x1 MERV 13 AC Furnace Filters 6 Pack Grow System/ Trays/ Reservoirs Philips recommends that you do

Philips recommends that you do not operate the lamp for less than 3 minutes or this can cause ignition issues

Spectrum & color analysis: Measures your light's color spectrum output

The hydrated blend maintains its unique open texture unlike other soil mixes

and other allergy triggers

20x26x1 MERV 13 AC Furnace Filters 6 Pack Grow System/ Trays/ Reservoirs Philips recommends that you doNordic Pure MERV 13 Pleated AC Furnace Air Filters provide exceptional filtration for both home and commercial environments. Each time air passes through a Nordic Pure pleated furnace air filter, lint, dust, pollen, bacteria, pet dander, dust mites, mold spores, smoke particles, virus carriers, coughs and sneezes, smog, allergens and other contaminants are removed. MERV 13 furnace filters are comparable to HVAC filters with the rating of MPR 2200