Round Die: M14 x 1, 38 mm OD, High Speed Steel MPN:5079442

The 12 x 18 x 1 pleated air filter features an impressive MERV 11 rating perfect for trapping allergens, dust mites, pollen particles while allowing adequate airflow making it suitable for asthma/allergy sensitive environments or public spaces wanting to maintain optimal IAQ levels; backed by wire providing strength and support ensuring longevity compared to paper alternatives therefore ideal HVAC system protector recommended annually without harming its capacity to remove tiny contaminants thus preserving energy costs minimizing breakdowns whilst promoting overall wellbeing inside any premise.