SELTZ D Prefilter Setup and Maintenance Guide
By Ferplast U.K. | Published: 2026-10-13
Category: How-to Guides
A practical step-by-step guide to fitting, checking and cleaning the SELTZ D prefilter so airflow stays strong and the main filter lasts longer.
Quick answer
Fit the prefilter on the intake side of your SELTZ D unit so it catches larger particles before they reach the main filter, then check it weekly and rinse or replace it when debris builds up. Always match the prefilter to your SELTZ D size, and switch the unit off before you open or refit anything.
Why the prefilter matters more than the main filter
The prefilter is the first line of defence in a SELTZ D air conditioning system. It captures larger particles before they reach the main filter, which helps maintain airflow and extends the life of the equipment. That means less strain on the unit and fewer replacements of the more expensive main filter. The SELTZ D Prefilter is a genuine Ferplast spare part, so it is designed to fit the SELTZ D range rather than being adapted from a generic pad.
Match the prefilter to your SELTZ D size
The SELTZ D Prefilter is available in two size options: 6000/1600-9000/2400 D AC (SKU XP2108) and 12000/3200 D AC (SKU XP2109). Check the model number on your unit before ordering, because the two sizes are not interchangeable. If your unit label is unclear, measure the existing prefilter housing or contact Ferplast U.K. with your model details rather than guessing.
What to check before you start
Switch off and unplug the SELTZ D unit, then let it stand for a few minutes. Have a soft brush, a bowl of lukewarm water and a towel ready. If you are replacing rather than cleaning, keep the old prefilter until the new one is seated correctly, so you can compare orientation and fit.
How often to clean or replace it
There is no universal interval, because dust and debris levels vary by room. A weekly visual check is a sensible habit: if the prefilter looks grey, matted or visibly loaded, clean it. If rinsing no longer restores airflow, replace it. Keeping a spare on hand avoids running the unit with a clogged prefilter while you wait for a delivery.
Step-by-step prefilter setup and care
- 1. Confirm your SELTZ D model and size: Find the model code on the unit label and match it to the correct prefilter size: 6000/1600-9000/2400 D AC (SKU XP2108) or 12000/3200 D AC (SKU XP2109). Checkpoint: if the label is missing or unreadable, do not order until you have confirmed the size with Ferplast U.K.
- 2. Isolate power and open the filter housing: Switch off and unplug the SELTZ D unit, then open the housing according to your model instructions. Keep the old prefilter in place until you are ready to swap it. Common mistake: working on a live unit. Always isolate power first.
- 3. Remove the old prefilter and note its orientation: Lift out the old prefilter and note which face was exposed to incoming air. This helps you seat the new one the same way. Checkpoint: if the old prefilter is torn or deformed, check the housing for sharp edges before fitting the new one.
- 4. Fit the new prefilter squarely: Seat the replacement prefilter so it sits flat against the housing with no gaps at the edges. Do not force it; if it does not sit flush, you may have the wrong size. Common mistake: pushing a slightly wrong size into place. A poor seal lets debris bypass the prefilter.
- 5. Close the housing and restore power: Reassemble the housing fully, then plug the unit back in and switch it on. Listen for any change in running noise. Checkpoint: unusual noise or reduced airflow after fitting usually means the prefilter is not seated correctly.
- 6. Check the prefilter weekly: Inspect the prefilter every week. If it looks grey, matted or visibly loaded with debris, it is due for cleaning or replacement. Next step: keep one spare prefilter so you are never running a clogged unit while waiting for a new one.
- 7. Clean gently or replace: If the prefilter is reusable in your model, rinse it in lukewarm water and let it dry fully before refitting. If rinsing no longer restores airflow, fit a new prefilter. Common mistake: refitting a damp prefilter. Let it dry completely first.
Product facts
- SELTZ D Prefilter: The SELTZ D Prefilter is a genuine Ferplast spare part designed to keep your SELTZ D air conditioning system operating efficiently. It captures larger particles before they reach the main filter, helping to maintain airflow and extend the life of your equipment. It is compatible with SELTZ D models and available in sizes 6000/1600-9000/2400 D AC (SKU XP2108) and 12000/3200 D AC (SKU XP2109). Buying the correct size and using a genuine part protects airflow and avoids the poor fit that comes with improvised alternatives.
