The 91-008 is the 15 inch x 15 inch x 2 inch replacement pre-filter for the Ultravation HEPA Whole House Air Cleaner model 93-001. The 91-008 is also the replacement pre-filter for the Ultravation Photronic Multistage Air Cleaner with true HEPA filtration models: 92-016, 92-017, 92-018 and 92-022.

The 91-008 replacement pre-filter uses Ultravation Progressive Media Filtration with Ultrastrand fiber technology, which meets and exceeds MERV 11 (ASHRAE 52.2) performance standards. Ultravation MERV 11 filters can capture particles as small as .3 microns in size. The specially shaped surface of an Ultrastrand fiber captures and holds particles far better than the typical round fiber. To increase capture ability still further, Ultrastrand fibers carry a permanent electrostatic charge that attracts particles like a magnet.

The manufacturer recommends you change the pre- filter every 6 months under normal operating conditions.

The 91-009 is the 15 inch x 15 inch replacement HEPA filter for the Ultravation HEPA Whole House Air Cleaner 93-001. The 91-009 is also the replacement HEPA filter for the Ultravation Photronic Multistage Air Cleaner with true HEPA filtration models: 92-016, 92-017, 92-018 and 92-022.

The Ultravation 91-009 Replacement HEPA filter media combines state of the art mini-pleat construction techniques with superior reliability to deliver maximum value. The HEPA filter media is manufactured with high efficiency glass microfiber media that is 99.97% efficient, when tested with .3 micron-size particles. The HEPA microfiber media is randomly tested and certified to meet minimum efficiency requirements. The media pack consists of a continuous sheet of the pleated glass microfiber that is moisture resistant and does not support the growth of bacteria or mold.

The manufacturer states that if you change your pre-filter regularly the HEPA filter can last as long as 5 years. We recommend that you change your HEPA filter every 3 to 5 years under normal operating conditions.

The 91-010 is the 17 1/2 inch x 17 1/2inch x 2 inch replacement MERV 11 pre-filter for the Ultravation HEPA Whole House Air Cleaner model 93-002. The 91-010 is also the replacement pre-filter for the Ultravation Photronic Multistage Air Cleaner with true HEPA filtration models: 92-019, 92-020, 92-021 and 92-023.

The 91-010 replacement pre-filter uses Ultravation Progressive Media Filtration with Ultrastrand fiber technology, which meets and exceeds MERV 11 (ASHRAE 52.2) performance standards. Ultravation MERV 11 filters can capture particles as small as .3 microns in size. The specially shaped surface of an Ultrastrand fiber captures and holds particles far better than the typical round fiber.To increase capture ability still further, Ultrastrand fibers carry a permanent electrostatic charge that attracts particles like a magnet.

The manufacturer recommends you change the pre-filter every 6 months under normal operating conditions.

The 91-011 is the 17 1/2 inch x 17 1/2 inch x 12 inch replacement HEPA filter for the Ultravation HEPA Whole House Air Cleaner 93-002. The 91-011 is also the replacement HEPA filter for the Ultravation Photronic Multistage Air Cleaner with true HEPA filtration models: 92-019, 92-020, 92-021 and 92-023.

The Ultravation 91-011 Replacement HEPA filter media combines state of the art mini-pleat construction techniques with superior reliability to deliver maximum value. The HEPA filter media is manufactured with high efficiency glass microfiber media that is 99.97% efficient, when tested with .3 micron-size particles. The HEPA microfiber media is randomly tested and certified to meet minimum efficiency requirements. The media pack consists of a continuous sheet of the pleated glass microfiber that is moisture resistant and does not support the growth of bacteria or mold.

The manufacturer states that if you change your pre-filter regularly the HEPA filter can last as long as 5 years. We recommend that you change your HEPA filter every 3 to 5 years under normal operating conditions.