18x28x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Led High Pressure Sodium has a

High Pressure Sodium has a light spectrum shifted towards the red

New patented UV booster

Includes Wall Adapter | Design: Exhaust | Dims

easy readings

This produces a massive crop

18x28x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Led High Pressure Sodium has aNordic 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