Are these genuine Rheem ProTech OEM filters?

Yes, all ProTech filters sold by Atomic Filters are genuine OEM (Original Equipment Manufacturer) filters made by Rheem/Rudd. We are an authorized dealer of authentic ProTech replacement filters.

What's the difference between nominal size and actual size for ProTech filters?

The nominal size (like 21x28x5) is the rounded measurement used for naming, while the actual size is slightly smaller (20-3/4" x 27-3/4" x 4-3/8") to ensure proper fit in your ProTech cabinet. Always verify actual dimensions before ordering.

How often should I replace my ProTech filter?

Rheem recommends replacing ProTech filters every 6-9 months under normal conditions, every 3-6 months if you have pets or allergies, and every 2-3 months during heavy use seasons. Monthly inspections help determine if earlier replacement is needed.

Will ProTech filters fit my Rheem Classic 90 Plus furnace?

Yes, ProTech filters are compatible with all Rheem Classic Series furnaces including the 90 Plus and 80 Plus models, as long as your system has a ProTech filter cabinet. Check your current filter's model number (PD540040-PD540045) to order the correct replacement.

What MERV rating are ProTech filters?

All ProTech OEM filters (PD540040 through PD540045) are MERV 8 rated, providing excellent filtration for dust, pollen, pet dander, and particles down to 3 microns while maintaining optimal airflow for Rheem and Rudd HVAC systems.

Do you offer bulk pricing for ProTech filters?

Yes, we offer discounted pricing on 2-packs and case quantities of ProTech filters. Bulk orders can save you up to 35% compared to buying individual filters. Perfect for property managers, contractors, and homeowners who want to stock up.

What's your shipping policy for ProTech filters?

We offer same-day shipping on all in-stock ProTech filters ordered before 11:30 AM EST Monday through Friday. Orders ship from our North Carolina warehouse. Free shipping is available on orders over $75.

Can I use a different MERV rating instead of MERV 8?

ProTech OEM filters are only available in MERV 8 rating, which is specifically engineered for optimal performance in Rheem and Rudd systems. Using non-OEM filters with different MERV ratings may affect system performance and could void warranties.

Collection: Rheem & Rudd OEM ProTech Furnace Filters - Genuine Replacement Parts

Genuine Rheem & Rudd ProTech OEM Furnace Filters

Maintain your Rheem or Rudd HVAC system with genuine OEM ProTech replacement filters from Atomic Filters. We stock the complete line of original ProTech filters (PD540040 through PD540045) at competitive prices with same-day shipping on orders placed before 11:30 AM EST M-F.

📦 In Stock & Ready to Ship: All ProTech OEM filters are in stock and ship the same day when ordered before 11:30 AM EST Monday-Friday.

ProTech OEM Filter Size Guide & Model Reference

Model Number	Nominal Size	Actual Dimensions	Fits Cabinet
PD540040	17.5x21x5 MERV 8	17-1/4" x 20-3/4" x 4-3/8"	ProTech 18x21 Cabinet
PD540041	17.5x28x5 MERV 8	17-1/4" x 27-3/4" x 4-3/8"	ProTech 18x28 Cabinet
PD540042	21x21x5 MERV 8	20-3/4" x 20-3/4" x 4-3/8"	ProTech 21x21 Cabinet
PD540043	21x28x5 MERV 8	20-3/4" x 27-3/4" x 4-3/8"	ProTech 21x28 Cabinet
PD540044	21x24.5x5 MERV 8	20-3/4" x 24-1/4" x 4-3/8"	ProTech 21x25 Cabinet
PD540045	24.5x28x5 MERV 8	24-5/32" x 27-3/4" x 4-3/8"	ProTech 25x28 Cabinet

Important: Always verify your filter's actual dimensions before ordering. The measurements listed above are the actual filter dimensions, which are slightly smaller than the nominal size to ensure proper fit in your ProTech cabinet.

Why Choose Genuine ProTech OEM Filters?

Factory-Original Performance
ProTech filters are engineered by Rheem and Rudd specifically for their HVAC systems. These genuine OEM filters ensure optimal airflow, maximum efficiency, and maintain your warranty requirements.

MERV 8 Rated Filtration
All ProTech filters feature MERV 8 media that effectively captures dust, pollen, pet dander, and particles down to 3 microns while maintaining proper airflow for your Rheem or Rudd system.

Perfect Fit Guarantee
As genuine OEM parts, ProTech filters are guaranteed to fit your existing Rheem or Rudd filter cabinet perfectly. No modifications, no gaps, no bypass - just slide in and go.

ProTech Filter Compatibility Guide

ProTech OEM filters are designed for use with:

✓ Rheem Classic Series (90 Plus, 80 Plus)
✓ Rheem Prestige Series (RA16, RA17, RA20)
✓ Rheem Ultra Series (U96V, U97V, U98V)
✓ Rudd Ultra Series (U96V, U97V, U98V)
✓ Rudd Achiever Series (R96T, R96V, R97V)
✓ All Rheem & Rudd systems with ProTech filter cabinets

When to Replace Your ProTech Filter

For optimal HVAC performance and indoor air quality, Rheem recommends replacing your ProTech filter:

Every 6-9 months under normal conditions
Every 3-6 months if you have pets or allergies
Every 2-3 months during heavy use seasons (summer/winter)
Monthly inspection recommended to check for excessive dust buildup

Installation Tips for ProTech Filters

Turn off your HVAC system before replacing the filter
Note the airflow arrow on your current filter before removal
Remove the old filter carefully to avoid spreading trapped dust
Install the new ProTech filter with the arrow pointing toward the furnace/air handler
Write the installation date on the filter frame for tracking
Set a reminder for your next filter change

Bulk Ordering & Savings Options

Save More with Multi-Packs:

Single filters for immediate needs
2-packs for semi-annual replacement schedules
Case quantities available for property managers and contractors
Save up to 35% compared to retail pricing

Why Buy ProTech Filters from Atomic Filters?

✓ Atomic Filters: Genuine OEM ProTech filters, not aftermarket copies
✓ Competitive Pricing: Save 25-35% vs. local HVAC dealers
✓ Fast Shipping: Same-day shipping on orders before 11:30 AM EST
✓ Expert Support: Filter specialists available to answer questions
✓ Trusted Since 2015: Over 4,100 reviews | satisfied customers nationwide
✓ Secure Ordering: Safe, encrypted checkout process

📞 Need Help Finding Your Filter?

Not sure which ProTech filter fits your Rheem or Rudd system? Our filter experts are here to help! Call us at 1-910-401-3910 or use our live chat for immediate assistance(M-F).

Order Your ProTech OEM Filters Today

Keep your Rheem or Rudd HVAC system running at peak performance with genuine ProTech OEM filters. Browse our complete inventory below and enjoy same-day shipping on in-stock filters.