The Airpua C600 air purifier features 26 lbs of specially blended carbon in a 3" deep carbon bed for great chemical, VOC, and smoke abatement. Rather than utilizing a HEPA filter, the C600 uses a HEPA barrier filter and 2 anti-microbial filers around the carbon filter to capture particles down to .3 microns. (Cost $100 for 6 filters that last 24 months). This unit is great for anyone with multiple chemical sensitivities or with a strong chemical abatement need. Here are some of the other outstanding characteristics of this air purifier: 1) Unobstructed air flow. Air is allowed to move freely through the filters without changing directions which created turbulence and limits true CFM ability. Result: Improved CFM. Noise reduction. 2) Great unit for MSC sufferers. A one piece motor and fan assembly .eliminates the vibration associated with traditionally designed fans that are attached to the motor shaft with screws. More importantly, the fan-motor is outside of the air flow, unlike other air cleaners, which prevents off-gassing. The Airpura's special Swiss made motor is smaller and quieter than any other motor on the market as well. It features a variable speed fan allows you to choose the perfect speed / noise level. Separate electrical part chambers also prevents off-gassing from capacitors, condensers or switches. 3) Pressure Sealed Body. Airpura's unique pressure sealing of the filter chamber ensures that all of the air passes through the air cleaning systems filters. Other machines allow leakage and thus do not actually achieve the full 99.97% HEPA filtration rating, especially plastic store bought HEPA machines. 4) Steel construction. No outgassing from ABS plastic. Also, felt gaskets seals in the filter chamber to maximize filtration without using rubber gaskets to further limit off-gassing. 5) Larger Carbon Canister. Airpura's C600 units feature 26 lbs of carbon in a 3 inch deep carbon canister for longer dwell time. More dwell time and more carbon means more odor, VOC, and chemical abatement capabilities. 6) HEPA barrier filter and 2 anti-microbial filers around the carbon filter to capture particles down to .3 microns instead of a HEPA filter.. 7) Superior Pre-filter design. 360 degree air intake, pre-filter can be vacuumed from outside the unit. Extends life of HEPA and Carbon filters. Specifications: Dimensions: 23" x 15" - Weight: 55 lbs. - 26 lbs. activated carbon, filter 13" x 13" x 9" - Carbon Bed: 3" deep x 570 sq'' surface - HEPA barrier post filter - 2 Anti-microbial inner filters - Air Flow: 560 cfm on high - Coverage: Up to 2000 sq. ft. 2 air changes per hour. 1000 sq. ft 4 air changes per hour. - Pre-filter: 570 sq. in. x 1" - Housing: Powder coated steel - Voltage Options: 115 or 220 volts - Watts: 120 on high, 40 on low - Sound Level: 28.1 db on low (at 6 feet); 62.3 db on high - Approvals: ETL certified - Warranty: 5 years parts, 10 years labor. The Airpura C600 ships free via FedEx Home Delivery or Ground to the USA and Canada. It is available in three colors: 1) Sandstone (shown). 2) White. 3) Black. Choose your color preference from the drop down menu.