FAQs

Frequently Asked Questions

Popular questions about HVAC filters and belts are listed below.
If your question is not covered or if you require support assistance, contact us on 603-821-3065.

Rigid Box Filters

What is a Rigid Box Filter?

A rigid box air filter is a type of air filter that is made from a sturdy, rigid material, such as galvanized metal or plastic. It is designed to fit tightly into the air ducts and is mainly used in commercial spaces, keeping out dust and other airborne particles, while allowing air to flow freely. The rigid box air filter is typically more effective than a standard disposable filter and can last much longer, making it a more cost-effective option than standard panel filters.

What is a box filter HVAC?

A box filter is a type of air filter that is made from a sturdy, rigid material, such as galvanized metal or plastic. It is designed to fit tightly into the air ducts and is mainly used in commercial spaces, keeping out dust and other airborne particles, while allowing air to flow freely. The rigid box air filter is typically more effective than a standard disposable filter and can last much longer, making it a more cost-effective option.

Can you wash or clean a rigid HEPA filter?

What are the advantages of box filters?

Reduced Maintenance: Box air filters require little to no maintenance and are very easy to install and replace.
Improved Air Quality: Box air filters provide excellent filtration and can help reduce allergy and asthma symptoms.
Cost Savings: Box air filters are generally more cost-effective than other types of filters and can help reduce energy costs by allowing more air to flow through the system.
Long-Lasting: Box air filters are very durable and can last for more than 1 year.
Easy to Install: Box air filters are designed to fit most standard-sized air ducts, making them easy to install.

How often do box filters need to be changed?

The length of time between changing your box filter will depend on the quality of the filter and the type of water that is being filtered. Generally, it is recommended to change the filter every 6–12 months.

HVAC Filters

How often should HVAC filters be changed?

HVAC filters should be changed at least every three months or as needed. If the filter looks visibly dirty, it should be changed immediately. Determining if a filter needs to be changed can also be based on when the resistance of the air filter reached the recommended maximum pressure drop recommended by the manufacturer. Gauges to determine pressure drop are most often found on larger commercial systems.

What is an HVAC air filter?

An HVAC air filter is a device that is used to capture airborne particles and contaminants from the air that passes through your air conditioning or heating system. The filter traps particles such as pollen, dust, pet dander, mold spores, and other allergens, which can help improve the air quality in your home or business.

How do you know if your HVAC air filter is bad?

One tell-tale sign that your HVAC air filter is bad is if you notice a decrease in air flow coming from your vents. You should also check the filter to see if it is visibly dirty or clogged with dust and debris. If it is, it’s time to replace the filter. You should also check the filter monthly and replace it every 1–3 months, depending on the type of filter you have.

How much should an HVAC air filter cost?

The cost of an HVAC air filter depends on the size and type of filter. Basic disposable filters typically range from $2 to $10 each, while higher-efficiency filters can cost up to $20 or more.

What happens if an HVAC filter is not changed?

Reduced airflow
Increased system strain and lower efficiency
Poor indoor air quality
Potential mold, mildew, and bacteria buildup

Does changing an HVAC air filter make a difference?

Yes. Running a system without a filter is not recommended, as it allows dust and allergens to enter the system and can damage components over time.

Will cleaning my AC filter make it colder?

A dirty filter restricts airflow, reducing efficiency and potentially causing overheating. It can also circulate dust and debris, worsening indoor air quality.

Why do HVAC filters get dirty so fast?

Factors include:

High air circulation
Poor air quality (dust, pollen, contaminants)
Pets or smoking indoors

These conditions require more frequent filter changes.

Does changing an HVAC air filter make a difference?

• Changing the HVAC air filter can make a difference in several ways. It helps to keep the indoor air clean, reduce allergens and pollutants, and improve the efficiency of the HVAC system. It also helps to extend the life of the system and reduce energy costs. Additionally, if the filter is clogged, it can reduce air flow and potentially cause damage to the HVAC system.

Can an HVAC system run without an air filter?

• Yes, an HVAC system can run without an air filter, but it is not recommended. Without an air filter, the system will draw in dust and allergens from the air, which can reduce the air quality and cause damage to the system's components over time.

Will cleaning my AC filter make it colder?

• No, cleaning your AC filter will not make it colder. The filter helps to keep the AC unit clean and running efficiently, but it does not directly affect the temperature produced by the unit. The temperature is regulated by the thermostat and the AC compressor.

What happens if an HVAC filter is dirty?

• If a HVAC filter is dirty, it can cause a number of problems. The most serious issue is that it can restrict airflow, causing the system to become less efficient and potentially overheat. This can also cause dust, dirt, and other airborne particles to get circulated through the home, leading to poor indoor air quality. Additionally, a dirty filter can cause dust and debris to build up in the system, leading to further problems.

Why do my HVAC filters get dirty so fast?

• The rate at which your HVAC filters get dirty depends on a few factors, such as the amount of air being circulated, the type of filter you have, and the amount of contaminants in your air. If you are in an area with higher levels of dust, pollen, and other contaminants, your HVAC filters will likely need to be changed more often. Additionally, if you have pets or smoke in the home, the filters will get dirtier more quickly.

Can I change the air filter while the AC is running?

• No, it is not recommended that you change the air filter while the air conditioner is running. Doing so could lead to system damage, and it could also cause air quality issues due to the disruption of the air flow. Additionally, changing the air filter while the air conditioner is running can also be dangerous, as you could be exposed to electrical shocks.

How often should AC filters be cleaned?

• AC filters should be cleaned or changed at least every three months, or more often if needed.

How do I change the filter in my HVAC unit?

• The steps for changing the air filter in an HVAC unit will vary depending on the type and model of unit you have. Generally, the steps to follow are:

1 Locate the air filter: The air filter is usually located in the return air duct of the HVAC system.

2 Remove the old filter: Remove the old filter from the unit and dispose of it properly.

3 Install the new filter: Insert the new filter into the unit and make sure it is properly secured.

4 Close the unit: Close the unit and make sure all connections and seals are secure.

5 Turn on the unit: Turn on the unit and make sure it is working properly.

How many filters does an HVAC unit have?

• The number of filters an HVAC unit has depends on the type and size of the unit. Generally, residential HVAC systems have one to four filters. Commercial HVAC units usually have four or more filters, depending on the size and complexity of the system.

What happens if the HVAC air filter is backwards?

• If the HVAC air filter is installed backwards, the system will not be able to properly filter the air. This will cause the system to be less efficient and can potentially cause damage to the system over time. It is important to always check the direction of the filter before installing it.

Are HVAC filters universal?

• No, HVAC filters are not universal; they come in a variety of sizes and shapes, so it's important to make sure you get the right size for your particular system.

Specialists in custom air filters

When it comes to indoor air quality improvement, no two indoor spaces are the same. Depending on the unique requirements of your building, custom size air filters could be the solution you need.

Unlike standard sizes such as 24x24x2, 20x25x2 and 20x20x2 which are designed to fit common configurations, many systems require customized dimensions. In many cases, this will be because your HVAC system is designed for a particular application. In other cases, standard filters may simply not provide the precise fit you need, leading to gaps that can compromise air quality and HVAC efficiency.

CREATE YOUR CUSTOM FILTER NOW

That's where Airex Filter Corporation's made-to-order air filters come in. Made in the USA and designed with precision, our celebrated solutions can be delivered with some of the shortest lead times on the market. How's that for a breath of fresh air?

Customer Specification

You provide your required custom sizes, quantities, and types.

Order Confirmation

Airex Filter Corporation confirms your order, offering confirmation details and drawings upon request.

Production Initiation

You approve the order details, and we begin production.

Manufacturing Process

Filters are precisely cut and capped to specified measurements using high-quality beverage board frames and hot glue for stability.

Additional Support

Supporting cross braces are added to larger custom filters as needed.

Quality Control

Each custom air filter is double-checked by the Quality Control team to ensure size, quantity, and quality standards are met.

🛒 PRODUCT PAGES (CORE REVENUE)

1. /hepa-filters/

H1: HEPA Filters — Maximum Air Purity for Critical Environments

Airex HEPA filters are engineered for environments where air quality is non-negotiable. Designed to capture 99.97% of airborne particles, our filters deliver hospital-grade performance.

H2: Applications

• Healthcare facilities

• Laboratories

• Cleanrooms

• Pharmaceutical production

H2: Why Airex HEPA Filters

• High-efficiency particle capture

• Low pressure drop design

• Custom configurations available

CTA: Request a Quote Today

2. /bag-filters/

H1: Bag Filters for High-Capacity HVAC Systems

Designed for high airflow systems, Airex bag filters provide extended life and superior dust holding capacity.

Benefits

• Longer service intervals

• Reduced maintenance costs

• Improved airflow efficiency

3. /panel-filters/

H1: Panel Air Filters — Reliable, Cost-Effective Filtration

Perfect for basic filtration needs with dependable performance and quick replacement cycles.

4. /carbon-filters/

H1: Carbon Air Filters — Odor & Gas Removal Solutions

Remove odors, VOCs, and harmful gases with activated carbon filtration.

5. /high-temperature-filters/

H1: High Temperature Air Filters for Industrial Applications

Engineered to perform in extreme heat environments without compromising efficiency.

6. /custom-air-filters/

H1: Custom Air Filters — Built to Your Exact Specifications

If it doesn’t exist, we’ll build it.

Capabilities

• Custom sizes

• Specialty materials

• Unique airflow requirements

🏭 INDUSTRY PAGES

7. /air-filters-for-warehouses/

H1: Air Filters for Warehouses & Distribution Centers

Reduce dust, improve air quality, and lower energy costs in large-scale environments.

8. /air-filters-for-schools/

H1: Air Filters for Schools & Classrooms

Cleaner air leads to healthier students and improved performance.

9. /air-filters-for-hospitals/

H1: Hospital Air Filtration Solutions

Meet strict healthcare standards with HEPA and high-efficiency filtration systems.

10. /air-filters-for-office-buildings/

H1: Air Filters for Office Buildings

Improve employee productivity and indoor air quality.

11. /air-filters-for-food-processing/

H1: Air Filtration for Food Processing Facilities

Prevent contamination and maintain compliance.

12. /air-filters-for-manufacturing/

(already provided—reuse)

13. /air-filters-for-data-centers/

H1: Data Center Air Filtration

Protect sensitive equipment from airborne contaminants.

14. /air-filters-for-pharmaceutical/

H1: Air Filtration for Pharmaceutical Facilities

Maintain cleanroom standards and regulatory compliance.

15. /air-filters-for-retail/

H1: Air Filters for Retail Spaces

Enhance customer experience through cleaner indoor air.

🧠 EDUCATION / AEO PAGES (TRAFFIC ENGINE)

16. /hepa-vs-merv/

H1: HEPA vs MERV Filters — What’s the Difference?

HEPA = highest efficiency
MERV = scalable filtration levels

17. /how-often-to-change-air-filters/

H1: How Often Should You Change Your Air Filter?

Typical range: every 1–3 months depending on usage.

18. /air-filter-size-guide/

H1: Air Filter Size Guide

Measure length × width × depth.

19. /best-air-filter-for-home/

H1: What Is the Best Air Filter for Your Home?

Depends on:

• Allergies

• Pets

• HVAC system

20. /what-do-air-filters-do/

H1: How Do Air Filters Work?

They capture airborne particles as air passes through the filter media.

21. /indoor-air-quality-guide/

(already provided concept—expand)

22. /benefits-of-clean-air/

H1: Benefits of Clean Indoor Air

• Better health

• Increased productivity

• Lower energy costs

23. /hvac-filter-buying-guide/

H1: HVAC Filter Buying Guide

Everything you need to choose the right filter.

24. /air-filter-mistakes/

H1: Common Air Filter Mistakes to Avoid

• Using wrong size

• Ignoring replacement schedule

• Choosing incorrect MERV

25. /energy-efficiency-air-filters/

H1: How Air Filters Impact Energy Efficiency

Better filters reduce system strain and energy usage.

📊 CASE STUDIES (HIGH-CONVERSION)

26. /case-study-office-building/

27. /case-study-hospital/

28. /case-study-manufacturing/

29. /case-study-warehouse/

30. /case-study-school/

(All follow same structure as earlier)

🧠 FAQ CLUSTER (AEO DOMINATION)

31. /what-merv-rating-do-i-need/

32. /are-expensive-filters-worth-it/

33. /can-air-filters-reduce-allergies/

34. /what-is-hepa-filter/

35. /how-to-install-air-filter/

Each page:

• Direct answer first

• 500–800 words

• FAQ schema ready

⚔️ COMPARISON PAGES (MONEY PAGES)

36. /airex-vs-camfil/

H1: Airex Filter vs Camfil

Key Points

• Manufacturer direct vs distributor pricing

• Faster response times

• Personalized service

37. /airex-vs-aaf/

38. /best-air-filter-brands/

📍 LOCAL SEO PAGES

39. /air-filters-new-hampshire/

40. /air-filters-massachusetts/

41. /air-filters-boston/

42. /air-filters-manchester-nh/

💰 CONVERSION PAGES

43. /why-airex-filter/

H1: Why Choose Airex Filter

• No hold times

• Direct pricing

• Massive inventory

44. /request-a-quote/

H1: Request a Quote

Fast, simple, direct.

45. /contact/

🧱 SUPPORT PAGES

46. /about-us/

H1: About Airex Filter Corporation

47. /careers/

48. /shipping-returns/

49. /terms/

50. /privacy-policy/

🔍 Primary SEO Keywords (High Intent)

These are the main “money keywords” the site is clearly targeting:

Commercial air filtration
Air filtration solutions
HVAC air filters
Air filters for commercial buildings
Industrial air filtration systems
Cleanroom air filtration
HEPA filters
Pleated air filters
Bag filters
Carbon air filters
Rigid air filters
Air filtration services
Indoor air quality solutions
Air purification systems

👉 These align directly with their positioning as a commercial & industrial filtration provider

🏭 Product-Specific Keywords

Pulled from product categories and descriptions:

HEPA air filters (medical-grade filtration)
Pleated HVAC filters (high-efficiency airflow)
Rigid box filters (industrial durability)
Bag filters (high dust-holding capacity)
Activated carbon filters (odor & VOC removal)
HVAC belts and accessories
Filter frames & housings
UV air filtration systems
Laminar flow benches
HEPA diffusers

👉 These keywords map to specific SKUs and buying searches

🧠 Service + Solution Keywords (B2B SEO Gold)

These target facility managers and decision-makers:

Air filtration installation services
HVAC filter replacement services
Preventative maintenance for air filtration
On-site air quality surveys
Filtration system optimization
Cleanroom design and installation
Airflow analysis (CFM calculations)
Indoor air quality consulting

👉 These reflect their full-service model (consult → install → maintain)

🧪 Industry / Use-Case Keywords

These help them rank in vertical markets:

Hospital air filtration systems
Pharmaceutical cleanroom filtration
Laboratory air filtration
Manufacturing air filtration solutions
Commercial building HVAC filtration
University facility air filters
Biotech cleanroom air systems

👉 They explicitly serve hospitals, labs, and industrial facilities

📊 Informational / Blog SEO Keywords (Top-of-Funnel)

From their blog content:

What is a pleated air filter
How air filters work
Air filter thickness vs performance
Best HVAC filter for air quality
How often to change air filters
Air filter MERV rating explained
Improve indoor air quality

👉 These capture educational search traffic and funnel into products

⚙️ Technical / Engineering Keywords

Used for more advanced SEO targeting:

CFM calculation (cubic feet per minute)
Air changes per hour (ACH)
HVAC airflow optimization
Dust holding capacity
Pressure drop in air filters
Energy-efficient filtration systems

👉 These are high-value for engineers & facility pros

🧩 Brand Positioning Keywords

These define how they differentiate:

Commercial air filtration experts
Trusted air filtration partner
Custom air filtration systems
70+ years filtration experience
Family-owned filtration company
Northeast air filter distributor

👉 Reinforces authority and trust signals

🧠 Hidden SEO Opportunities (They’re Targeting Implicitly)

These aren’t always explicit but are strongly implied:

Same-day air filter delivery
Bulk HVAC filters supplier
Air filter distributor near me
Replacement air filters for facilities
Cost-effective air filtration
Energy-saving HVAC filters

🧭 Quick SEO Strategy Breakdown

FilterSales.com is structured around 3 keyword pillars:

1. Transactional (Revenue)

“buy HEPA filters”
“commercial HVAC filters”
“industrial air filtration systems”

2. Service-Based (High Ticket)

“air filtration maintenance”
“cleanroom installation”
“HVAC filter service company”

3. Educational (Traffic Engine)

“what is a pleated filter”
“are thicker filters better”
“how to improve indoor air quality”

🚀 If You’re Competing (AirexFilter Insight)

To beat them, you’d want to go harder on:

“manufacturer direct air filters”
“custom filter manufacturing”
“fast nationwide filter delivery”
“OEM equivalent air filters”
“bulk pricing air filters”

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