3M Company 9845-4PK Air Filter 18x20x1 Mpr 1000 4-pack

Product Description

The 3M COMPANY 9845-4PK is an electrostatically charged pleated air filter rated at MPR 1000, sold in a 4-pack. Measuring 18 inches x 20 inches x 1 inch, it is designed to fit standard residential HVAC systems and replace disposable 1-inch filters on a regular maintenance schedule. The electrostatic charge helps the filter media capture airborne particulates including large allergens such as mold spores and pet dander, as well as finer particles like dust, smoke, smog, and bacteria-carrying particles. HVAC technicians and service pros install these during routine filter-change visits. Each filter is rated to last up to 3 months under typical residential operating conditions.

This filter is intended for residential forced-air HVAC systems including central air conditioners and gas or electric furnaces using standard 1-inch filter slots. The 18 x 20 x 1 inch nominal size fits a wide range of residential air handler and furnace filter racks. The MPR 1000 rating indicates effective filtration of microscopic allergens, smoke, and smog particles in addition to larger debris. Meets the guidelines of the American Lung Association Health House Program, making it appropriate for households with allergy or asthma concerns. Supplied as a 4-pack to support quarterly filter replacement schedules.

Key Features

• MPR 1000 filtration rating captures large allergens including mold spores and pet dander
• Electrostatically charged media attracts and holds microscopic particles such as dust, smoke, and smog
• Captures bacteria particles that can carry viruses
• Meets American Lung Association Health House Program guidelines
• Each filter rated for up to 3 months of service life
• 4-pack quantity supports a full year of quarterly replacements

Compatibility

Designed as an OEM-style replacement 1-inch pleated air filter for residential forced-air furnace and air handler systems with an 18 x 20 x 1 inch nominal filter slot.

Installation Notes

Air filter replacement is a routine maintenance task performed by HVAC technicians or qualified service professionals. Before replacing the filter, set the thermostat to off and confirm the air handler or furnace blower has stopped. Insert the filter with the airflow arrow on the frame pointing toward the blower and away from the return air duct. Inspect the filter monthly and replace every 3 months or sooner if loading conditions reduce airflow noticeably.

Technical Specifications

• Filter Size (Nominal): 18 x 20 x 1 inches
• MPR Rating: 1000
• Filter Life: Up to 3 months
• Filtration Media: Electrostatically charged pleated
• Color: Red
• Package Quantity: 4 filters per pack
• Package Weight: 3 pounds
• Unit of Measure: EA

Standard Information

• Brand: 3M COMPANY
• Manufacturer Part Number: 9845-4PK