Filterbuy AFB18x30x1M11pk6 MERV 11 Air Filter, 18x30x1, 6-Pack

Electrostatically charged pleated media gives this Filterbuy MERV 11 filter a practical role in HVAC systems where dust and allergens are a concern. Its six-filter pack makes it easy to keep replacements on hand for scheduled changes.

The nominal 18x30x1 size is designed for furnaces, air conditioners, heat pumps, and HVAC systems. The actual size is 17.75 x 29.75 x 0.75 inches, so matching the measurements of your existing filter helps ensure the right fit.

A rigid frame with dual wire backing supports the pleated filter media. Made in the USA, the filters are constructed with industrial-grade, recyclable materials.

How it fits

Use this filter in a compatible furnace, air conditioner, heat pump, or HVAC system that takes a nominal 18x30x1 filter. The precise dimensions are 17.75 inches long, 29.75 inches wide, and 0.75 inches thick. Nominal dimensions are rounded sizing labels, while actual dimensions describe the filter itself, compare the actual measurements with your current filter or filter slot before choosing a replacement.

For installation, turn off the system, remove the intake cover and old filter, then slide the replacement into the slot with its airflow direction aligned to the system. Replace the cover before turning the system back on. Filterbuy generally recommends changing the filter every 90 days, household conditions such as pets and allergies can affect how often a replacement is needed.

Benefits

MERV 11 synthetic media is designed to capture dust and allergens. The manufacturer states that it captures 95% of dust without restricting airflow. Electrostatic charging and 14 pleats per foot provide a densely pleated surface for filtration, making this a more filtration-focused alternative to basic fiberglass models. Filterbuy states that the media lasts three times longer than fiberglass models.

The frame combines beverage board with dual wire backing to help resist warping and support the filter during use. The six-pack is useful for keeping future replacements ready, whether you maintain one system or several vents that use this size.

Customer feedback often highlights dust reduction, airflow, and a sturdy feel. Experiences with fit and durability vary, so using the actual dimensions to match your filter slot is a practical step when selecting this size.

Tech specs

• Type: Pleated HVAC air filter
• MERV rating: 11
• Nominal size: 18x30x1
• Actual size: 17.75 x 29.75 x 0.75 inches
• Pack size: 6 filters
• Compatible systems: Furnaces, air conditioners, heat pumps, and HVAC systems
• Construction: Electrostatic synthetic media, beverage board frame, and dual wire backing
• Origin: Made in the USA

What to clarify

What does 18x30x1 mean? It is the nominal size. The filter’s actual dimensions are 17.75 x 29.75 x 0.75 inches, which are the measurements to compare with your current filter or slot.

Can I use it in a heat pump or air conditioner? Yes. It is listed for furnaces, air conditioners, heat pumps, and HVAC systems, provided the system takes the correct filter size.

How often should I replace it? Filterbuy generally recommends replacement every 90 days. Pets, allergies, and other household conditions can affect the replacement interval.

Buying verdict

This six-pack suits routine replacement needs for systems that use an 18x30x1 filter and for households looking for MERV 11 filtration focused on dust and allergens. Its electrostatic pleated media, reinforced frame, and clearly stated actual dimensions make it a practical choice when those features match your system and filtration priorities.