Organic materials are absent entirely.

Media is glass, ceramic or metal.

Frames are stainless or high-temperature alloy.

Binders and adhesives are eliminated or replaced.

Sealing is often mechanical rather than glued.

They sit at the top of the range.

Considerably, and it changes the priority.

Air into an oven protects the product.

Efficiency is what matters there.

Air out protects equipment and atmosphere.

Chemical resistance matters more there.

State the direction when enquiring.

It attacks media independently of heat.

Curing ovens drive off solvents and plasticisers.

Heat treatment produces oil vapour and smoke.

A correct temperature rating is not enough.

Filters fail quickly in hostile chemistry.

Describe the process, not just the temperature.

It can often be cleaned and reused.

Sintered or woven elements are washable.

A consumable becomes an asset with a cycle.

On large continuous plant that dominates cost.

Cleaning method must suit the deposit.

Ask how many cycles are realistic.

Gaskets that seal cold can relax hot.

Bypass then appears only in service.

Nothing shows during a cold inspection.

Clamping arrangements matter more than material alone.

Re-check clamping at working temperature.

Thermal expansion of the housing contributes.

By pressure drop and by inspection.

Deposits from the process load them unevenly.

Visual checks catch distortion and cracking.

Metal media is inspected for blinding.

Cleanable media has a finite number of cycles.

Record both pressure and condition.

Continuous and peak temperatures.

Airstream composition including solvents and oils.

Direction of flow relative to the process.

Whether cleanable media is wanted.

Housing dimensions and clamping method.

Any product contamination requirement.