1. Introduction
This manual provides essential information for the proper installation, usage, and maintenance of your Aerostar 13x21 1/2x1 MERV 8 Pleated Air Filter. Adhering to these instructions will ensure optimal performance and longevity of your filter, contributing to a healthier indoor air environment.
2. Product Overview
The Aerostar MERV 8 Pleated Air Filter is designed to capture microscopic particles, improving air quality in your home or business. It is suitable for use in AC and furnace systems.

Image: A six-pack of Aerostar 13x21 1/2x1 MERV 8 Pleated Air Filters, showing the product packaging and individual filters.
Key Features:
- MERV 8 Rating: Efficiently filters out common airborne particles.
- Synthetic Electrostatic Media: Provides high efficiency with low airflow resistance.
- Actual Size: 12 7/8" x 21 1/2" x 3/4" (Nominal Size: 13 x 21 1/2 x 1).
- Made in the USA: Manufactured by Filtration Group.

Image: Diagram illustrating the actual dimensions of the air filter: 21.50 inches in length, 12.875 inches in width, and 0.75 inches in depth.
What MERV 8 Filters Out:
The MERV 8 rating indicates the filter's ability to capture particles between 3.0 and 10.0 microns. This includes:
- Dust Mites
- Dust & Lint
- Mold Spores
- Pollen

Image: Graphic detailing what MERV 8 filters out, including icons for dust mites, dust & lint, mold, and pollen.
3. Installation
Follow these steps for proper installation of your Aerostar air filter:
- Unpack: Carefully remove the new filter from its packaging.
- Identify Airflow Direction: Locate the arrow on the filter frame. This arrow must point in the direction of the airflow towards your furnace or air handler.
- Remove Old Filter: Open the filter compartment of your HVAC system and remove the old filter. Note its orientation.
- Insert New Filter: Slide the new Aerostar filter into the compartment, ensuring the arrow points correctly. For central units, slide it into the designated slot. For wall units, ensure it fits securely.
- Secure Compartment: Close and secure the filter compartment door.

Image: A four-step visual guide demonstrating how to install an air filter: 1) Unpack, 2) Follow the arrow indicating airflow, 3) Slide into a central unit slot, and 4) Slide into a wall unit slot.
4. Usage and Maintenance
Regular filter replacement is crucial for maintaining indoor air quality and the efficiency of your HVAC system.
Filter Replacement Frequency:
- For best results, change your filter every 60 to 90 days under normal conditions.
- Increase frequency to every 30 days during peak summer and winter months, or if you have pets, allergies, or perform home renovations.

Image: A calendar icon with text indicating to replace 1-inch filters every 2-3 months, and every 30 days during peak months.
Factors Affecting Filter Life:
Certain activities and environmental factors can necessitate more frequent filter changes:
- Lighting candles regularly.
- Smoking indoors.
- Presence of pets.
- Frequent use of a fireplace.
- Running the HVAC fan often.
- Ongoing home improvement projects.

Image: Graphic explaining that indoor air can be 2-5 times worse than outdoor air, and listing reasons to change filters often, such as light candles, smoke, pets, fireplace, running the fan often, and home improvements.
5. Troubleshooting
If you experience issues with your HVAC system after filter installation, consider the following:
- Reduced Airflow: Ensure the filter is installed with the arrow pointing in the correct direction of airflow. A heavily soiled filter can also restrict airflow; check if it's time for a replacement.
- Improper Fit: Verify that the actual filter size matches the requirements of your HVAC system. An ill-fitting filter can allow air to bypass the filtration media.
- Unusual Noises: A loose filter can vibrate. Ensure it is securely seated in the filter compartment.
6. Specifications
| Specification | Detail |
|---|---|
| Brand | Aerostar |
| Model Number | P25S |
| Nominal Size | 13 x 21 1/2 x 1 inches |
| Actual Size | 12 7/8" x 21 1/2" x 3/4" inches |
| MERV Rating | 8 |
| Material Type | Synthetic |
| Compatible Devices | Air Conditioner, Furnace |
| Item Weight | 2.14 pounds (for 6-pack) |
| UPC | 192212003532 |
7. Support
For further assistance, questions, or concerns regarding your Aerostar air filter, please refer to the official Aerostar website or contact their customer support. Specific warranty information may be available through your point of purchase or the manufacturer's official channels.



