... minutes;B. trimethylamine: removal rate ≥ 90% in 30 minutes3. Heat resistance: the temperature range: -20°C~130°C.4. ... to 15-60ppi, ppi is hole count within a 1-inch length)Product usage: air cleaner, household air-conditioner, central air-conditioning, air ... , activated carbon cotton cloth filter, activated carbon fibre air filter (or fabric), granular activated carbon heap, paper frame activated ...