Flat-Pleated High-Capacity Filter (MDF Frame)

HIGH-AIRFLOW HVAC AIR FILTER

Flat-Pleated High-Capacity Filter (MDF Frame)

Flat-Pleated High-Capacity Filter (MDF Frame) is an air filter with a large filtration surface and high dust-holding capacity, designed to capture fine particles in supply and exhaust HVAC systems operating at high airflow rates.

With glass-fiber filter media, hot-melt pleat separators and a 292 mm deep MDF frame, it provides a nominal airflow of up to 4.000 m³/h in the 610 × 610 mm full-module size. M34 and M40 capacity options can be selected according to system airflow and the permissible pressure drop.

MDF Frame
292 mm Depth
Up to 4.000 m³/h

Flat-Pleated High-Capacity Filter with MDF frame for HVAC systems

Filter Standard

ISO 16890

Nominal Airflow

850–4.000 m³/h

Filtration Area

4–24 m²

Maximum Temperature

80°C

What Is a Flat-Pleated High-Capacity Filter?

The flat-pleated high-capacity filter is a rigid fine-filtration product in which glass-fiber filter media is formed into a regular, closely spaced pleat structure. Pleat spacing is maintained with hot-melt separators, while the filter pack is secured inside an MDF frame.

The large media surface helps distribute the particle load more evenly across the filtration area. Therefore, high airflow can be handled within the same face dimensions while keeping the media face velocity under control.

The product can be evaluated in ISO ePM1, ISO ePM2,5 and ISO ePM10 classes according to ISO 16890. M6, F7, F8 and F9 designations used in model codes are historical classifications from the withdrawn EN 779 standard.

M34 and M40 Capacity Options

The capacity code indicates the nominal airflow and media area of the 610 × 610 × 292 mm full-module filter. For smaller face dimensions, airflow and filtration area decrease proportionally.

M34 Capacity

3.400 m³/h

Provides up to 16 m² filtration area in the 610 × 610 × 292 mm full module.

M40 Capacity

4.000 m³/h

Provides up to 24 m² filtration area in the 610 × 610 × 292 mm full module.

Filter Selection and Application Process

Airflow

The actual and nominal airflow per filter is determined.

Filter Class

ISO ePM1, ePM2,5 or ePM10 class is selected according to the intended use.

Capacity

M34 or M40 media capacity is selected according to system requirements.

Installation and Gasket

The filter housing, airflow direction and sealing requirements are checked.

Pressure Monitoring

Initial and final pressure-drop limits are defined in the automation system.

Technical Specifications

Filter standard	ISO 16890	Maximum operating temperature	80°C
Filter classes	ISO ePM1, ISO ePM2,5 and ISO ePM10	Filter media	Glass fiber
Historical EN 779 classes	M6, F7, F8 and F9	Frame type	MDF
Standard depth	292 mm	Standard face dimensions	305 × 305, 305 × 610 and 610 × 610 mm
Capacity options	M34 and M40	Nominal airflow	850–4.000 m³/h
Filtration area	4–24 m²	Initial pressure drop	60–130 Pa depending on class
Gasket options	EPDM, gray EPDM and poured gasket	Sealing compound	Polyurethane
Separator	Hot-melt adhesive	Surface protection	Optional, on clean-air or dirty-air side
Recommended final pressure drop	According to the EN 13053 approach, whichever is lower: initial ΔP + 100 Pa or initial ΔP × 3

Standard note: EN 779 has been withdrawn. M6, F7, F8 and F9 classes are retained only to identify historical product codes. Current filter selection should be based on ISO 16890 classification and valid product test data.

Product Coding System

Filter Type	Filter Class	Frame	Capacity	Dimensions	Surface Protection	Gasket
AR Flat-Pleated High-Capacity Filter MDF Frame	M6 F7 F8 F9Historical EN 779 classes.	M: MDF	34: 3.400 m³/h 40: 4.000 m³/hFor 610 × 610 × 292 mm.	Width × Height × Depth 305 × 305 × 292 mm 305 × 610 × 292 mm 610 × 610 × 292 mm	FW: None FC: Clean-air side FD: Dirty-air side FB: Both sides	W: None P: Poured gasket PP: Double-sided poured gasket E: EPDM EE: Double-sided EPDM C: Gray EPDM CC: Double-sided gray EPDM

Example Product Code

AR-F8-M-40-610-610-292-FW-P

Flat-pleated high-capacity filter – historical F8 class – MDF frame – 4.000 m³/h capacity – 610 × 610 × 292 mm – without surface protection – poured gasket

M34 Capacity Models

The nominal airflow for the 610 × 610 × 292 mm full module is 3.400 m³/h.

Filter Model	EN 779 (withdrawn)	ISO 16890	Dimensions W × H × D (mm)	Filtration Area (m²)	Nominal Airflow (m³/h)	Initial Pressure Drop (Pa)
AR-M6-M-34-305-305-292-FW-P	M6	ePM10 75%	305 × 305 × 292	4	850	60
AR-M6-M-34-305-610-292-FW-P	M6	ePM10 75%	305 × 610 × 292	8	1.700	60
AR-M6-M-34-610-610-292-FW-P	M6	ePM10 75%	610 × 610 × 292	16	3.400	60
AR-F7-M-34-305-305-292-FW-P	F7	ePM1 55%	305 × 305 × 292	4	850	80
AR-F7-M-34-305-610-292-FW-P	F7	ePM1 55%	305 × 610 × 292	8	1.700	80
AR-F7-M-34-610-610-292-FW-P	F7	ePM1 55%	610 × 610 × 292	16	3.400	80
AR-F8-M-34-305-305-292-FW-P	F8	ePM1 70%	305 × 305 × 292	4	850	100
AR-F8-M-34-305-610-292-FW-P	F8	ePM1 70%	305 × 610 × 292	8	1.700	100
AR-F8-M-34-610-610-292-FW-P	F8	ePM1 70%	610 × 610 × 292	16	3.400	100
AR-F9-M-34-305-305-292-FW-P	F9	ePM1 80%	305 × 305 × 292	4	850	130
AR-F9-M-34-305-610-292-FW-P	F9	ePM1 80%	305 × 610 × 292	8	1.700	130
AR-F9-M-34-610-610-292-FW-P	F9	ePM1 80%	610 × 610 × 292	16	3.400	130

M40 Capacity Models

The nominal airflow for the 610 × 610 × 292 mm full module is 4.000 m³/h.

Filter Model	EN 779 (withdrawn)	ISO 16890	Dimensions W × H × D (mm)	Filtration Area (m²)	Nominal Airflow (m³/h)	Initial Pressure Drop (Pa)
AR-M6-M-40-305-305-292-FW-P	M6	ePM10 75%	305 × 305 × 292	6	1.000	60
AR-M6-M-40-305-610-292-FW-P	M6	ePM10 75%	305 × 610 × 292	12	2.000	60
AR-M6-M-40-610-610-292-FW-P	M6	ePM10 75%	610 × 610 × 292	24	4.000	60
AR-F7-M-40-305-305-292-FW-P	F7	ePM1 55%	305 × 305 × 292	6	1.000	80
AR-F7-M-40-305-610-292-FW-P	F7	ePM1 55%	305 × 610 × 292	12	2.000	80
AR-F7-M-40-610-610-292-FW-P	F7	ePM1 55%	610 × 610 × 292	24	4.000	80
AR-F8-M-40-305-305-292-FW-P	F8	ePM1 70%	305 × 305 × 292	6	1.000	100
AR-F8-M-40-305-610-292-FW-P	F8	ePM1 70%	305 × 610 × 292	12	2.000	100
AR-F8-M-40-610-610-292-FW-P	F8	ePM1 70%	610 × 610 × 292	24	4.000	100
AR-F9-M-40-305-305-292-FW-P	F9	ePM1 80%	305 × 305 × 292	6	1.000	130
AR-F9-M-40-305-610-292-FW-P	F9	ePM1 80%	305 × 610 × 292	12	2.000	130
AR-F9-M-40-610-610-292-FW-P	F9	ePM1 80%	610 × 610 × 292	24	4.000	130

Manufacturing and tolerance note: Custom dimensions can be evaluated after verifying face dimensions, filtration area, airflow, frame strength and pressure drop. According to the source technical statement, differential-pressure tolerance should be evaluated using whichever is greater: “±10% + 5 Pa” or “10 Pa + 5 Pa”.

Structural Components

Glass-Fiber Media

High-surface-area pleated filter media used to capture fine particles.

MDF Frame

A frame structure that supports the filter pack around its perimeter and is suitable for dry, controlled HVAC environments.

Hot-Melt Separator

Helps maintain pleat spacing and keeps the airflow passages uniform.

Polyurethane Sealing

Limits peripheral air leakage between the filter pack and MDF frame.

Optional Surface Protection

The filter media can be supported with protective surfaces on the clean-air side, dirty-air side or both sides.

Gasket Options

EPDM, gray EPDM or poured-gasket options can be applied according to the filter housing.

Applications

High-airflow air handling units

HVAC supply-air systems

Controlled exhaust systems

Industrial process ventilation

Multi-stage fine filtration

Dry and controlled technical areas

Product Advantages

High airflow: Provides nominal capacity of up to 4.000 m³/h in the full-module configuration.

Large filtration area: Provides up to 24 m² of filter surface with the M40 option.

High dust-holding capacity: Helps distribute the particle load over a large media surface.

Low initial pressure drop: Provides an initial pressure drop of 60–130 Pa depending on the filter class.

Rigid body: The MDF frame supports the geometric form of the filter pack.

Flexible sealing: Different gasket and surface-protection options can be applied.

Filter Selection Criteria

Actual airflow through each filter
ISO ePM1, ePM2,5 or ePM10 requirement
M34 or M40 capacity requirement
Filter face dimensions and 292 mm installation depth
Permissible initial and final pressure drop

Ambient relative humidity and condensation risk
Dust concentration and particle size
Gasket position and mounting surface
Surface-protection requirement
Annual operating hours and energy consumption

MDF frame application note: The suitability of the MDF frame should be evaluated separately in applications involving continuously high humidity, heavy condensation, wash-down environments, outdoor exposure or chemical-corrosion risk. Metal or moisture-resistant alternative frame constructions may be preferred under such conditions.

Inspection and Maintenance

Filter pressure drop should be monitored using a differential-pressure gauge or a pressure transmitter connected to the automation system. The filter replacement decision should be based not only on operating time but also on actual airflow and measured pressure drop.

During periodic inspections, the MDF frame should be checked for swelling, cracking or deformation; the filter media for tears; the pleat structure for damage; the hot-melt separators for separation; the polyurethane seal for cracks; and the gaskets for hardening.

Unless the product is specifically stated to be washable, it should not be cleaned with water, chemical cleaners or high-pressure air. Wet cleaning may cause deformation of the MDF frame and performance loss in the glass-fiber filter media.

Frequently Asked Questions

Where is an MDF-framed high-capacity filter used?

It is used for fine-particle filtration in high-airflow HVAC supply and exhaust systems operating under dry and controlled conditions.

What is the difference between M34 and M40?

M34 provides 3.400 m³/h and 16 m² in the full module, while M40 provides 4.000 m³/h and 24 m² filtration area.

Can an MDF frame be used in humid environments?

An MDF frame may not be suitable for environments with continuously high humidity or condensation. Environmental conditions should be verified and a metal frame selected where necessary.

Are F7, F8 and F9 classes still current?

No. These are historical classes from the withdrawn EN 779 standard. Current selection should be made according to ISO 16890.

How is the filter replacement time determined?

Differential pressure, airflow, particle load, operating time and the permissible final pressure drop should be evaluated together.

Technical Application Note

The airflow, filtration area, ISO 16890 class, initial pressure drop and operating-temperature values stated in the tables are source product data. Actual performance may vary depending on process conditions, including installation method, filter test area, actual airflow, media face velocity, system pressure, filter-housing and duct leakage, gasket compression, calibration of measuring instruments, particle size, dust load, relative humidity, condensation, temperature, operating time and maintenance conditions. The stated values do not constitute an unconditional guarantee of filter service life, energy consumption or filtration performance for every application.

Select the Right MDF-Framed Filter for Your HVAC System

Contact Airtes to select the appropriate product according to airflow, ISO 16890 class, filter dimensions, M34 or M40 capacity, ambient humidity and permissible pressure drop.

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Flat-Pleated High-Capacity Filter (MDF Frame)