GeneralAire AC-1 MERV 11 Replacement Filter (2 Pack) | 12758/4001

Overview

The GeneralAire AC-1 MERV 11 replacement filter is offered as a convenient two-pack, designed to simplify routine HVAC upkeep. It uses a micro-fiber expandable media that fills the filtration space evenly, helping create a stable, efficient barrier without tearing during handling. With a MERV 11 rating, the filter targets a broad spectrum of common household particles, supporting a fresher-feeling living environment without adding complexity to maintenance routines.

Key benefits and features

• 12758 / 4001 replacement micro-fiber expansion media delivers reliable filtration
• Expandable, No-Tear design helps protect the filter edges during installation
• Two-pack provides a ready replacement for ongoing maintenance
• Designed for compatibility with GeneralAire units (AC22, AC1, AC3) and select Carrier/Bryant models

Compatibility and fit

This filter is intended to work with GeneralAire AC22, AC1, and AC3 systems. Compatibility notes also reference related units and model numbers such as Source 1 S1-MAC11202506 and S1-FM11202506, Carrier 31M020100, 31MF020, 31MF120, and Bryant equivalents 902BXX020 and 902BX. When in doubt, compare your current filter frame size and airflow direction to ensure a proper fit.

What’s in the box

• 2 x GeneralAire AC-1 MERV 11 replacement filters (12758/4001)

Installation tips and daily use

Before replacing, power off the HVAC system and locate the filter slot. Align the airflow arrow on the frame with your system’s airflow direction, insert firmly without forcing, reattach the housing, and power the unit back on. For ongoing use, keep a spare in the closet or utility space to simplify seasonal changes. The two-pack helps keep you equipped for routine replacements without frequent trips to the store.