Pre Filter (MERV 4-8)

Product Description

Pre Filters with MERV 4 to MERV 8 ratings are designed for primary stage air filtration in HVAC systems, protecting higher-efficiency filters such as mini pleat, HEPA, or carbon filters from premature clogging. These filters capture larger airborne particles like dust, lint, pollen, fibers, insects, and debris, ensuring improved air quality, equipment performance, and extended service life for downstream filters.

Constructed with synthetic or fiberglass media and often supported with a metal or cardboard frame, these filters are available in panel or pleated configurations. Pleated pre filters offer higher dust-holding capacity and longer service life compared to flat panel filters.

📌 Key Features

• Efficiency Range:

  • MERV 4“5: Captures large particles (‰10 microns) like lint and dust

  • MERV 6“8: Captures smaller particles (3“10 microns) like mold spores and pollen

• Media Type: Fiberglass, polyester, or synthetic non-woven

• Construction: Rigid cardboard, galvanized steel, or plastic frames

• Available Formats: Flat panel, pleated panel, V-bank (high capacity)

• Applications:

  • Commercial and residential HVAC systems

  • Manufacturing facilities

  • Cleanrooms (as a pre-stage)

  • Hospitals, schools, data centers

• Service Life: Typically 1“3 months, depending on environment and usage

• Benefits:

  • Cost-effective particle filtration

  • Reduces load on final filters

  • Easy to install and replace

“ FAQs “ Mini Pleat Filters (in relation to Pre Filters)

1. What is the purpose of using pre filters before mini pleat filters?

Pre filters capture larger airborne particles, preventing them from clogging the fine media in mini pleat filters. This extends the life span and maintains the efficiency of downstream filters.

2. Can mini pleat filters work without pre filters?

Technically yes, but not recommended. Without pre filters, mini pleat filters will clog faster, leading to higher pressure drops, increased energy usage, and more frequent replacements.

3. How do MERV ratings compare between pre filters and mini pleat filters?

• Pre filters: MERV 4“8 (captures particles ‰3 microns)

• Mini pleat filters: MERV 13“16 or HEPA (captures particles ‰1 micron)
  They work together to provide multi-stage filtration.

4. How often should pre filters be replaced compared to mini pleat filters?

• Pre filters: Every 1“3 months

• Mini pleat filters: Every 6“12 months
  Pre filters are lower-cost consumables and designed to be changed more frequently.

5. Can pleated pre filters be reused or cleaned?

Generally no. Most pleated pre filters are disposable. Cleaning them can damage the media and reduce filtration efficiency.

6. Are pre filters available in mini pleat design?

No. Pre filters are not manufactured in mini pleat form. The mini pleat design is reserved for higher-efficiency filters (MERV 13+, HEPA, ULPA) that need more media surface in compact space.

7. What happens if I skip using a pre filter?

Skipping pre filters can result in:

• Premature clogging of high-efficiency filters

• Higher maintenance costs

• Increased energy consumption

• Reduced indoor air quality