Quest Merv 13 Filter for Quest 506, 706, 746, 876 - 20 x 17.88 x 2 Current Culture It performs at 7

It performs at 7

One quart makes about 21 gallons of finished spray

It suits dairies

The built in amplifier will reduce the effects of electrical noise on the high impedance pH measurement

Quest Merv 13 Filter for Quest 506, 706, 746, 876 - 20 x 17.88 x 2 Current Culture It performs at 7Quest MERV 13 filter for 506, 706, 746, and 876 dehumidifiers This MERV 13 media filter drops into Quest 506, 706, 746, and 876 dehumidifiers. It pulls dust, pollen, mold, bacteria, and some viruses out of the air. MERV 13 catches 65% more fine particulate than MERV 8 and about 20% more than MERV 11. Each unit takes two filters, so replace both at the same time to keep airflow even. The filter measures 20 x 17. 88 x 2 inches to fit the 6 series slot