Keep your Therapure air purifier running at optimal efficiency with the Replacement HEPA Filter from ENVION. Make sure you're trapping every particle you can while maintaining your machine's peak performance. Compatible with Thermapure TPP230H and TPP240D air purifiers, this replacement purifier filter is exactly what you need to keep your purifier up and running. The foam gasket closes in the air for high-performance filtration that directs air through the filter and keeps it from escaping out the sides. This filter is made from durable material that's cleanable and long-lasting for repeated use saving you money. Get rid of anything as small as 0.3 microns and keep your space clean and safe with this filter. Don't waste electricity on a purifier that doesn't have a clean filter. With the Replacement HEPA Filter from ENVION, your Therapure cleaner will be as good as new.