Filter size calculation for HVAC system
Filter size calculation for HVAC system To calculate the filter size for an HVAC system, you'll need to consider the following factors: 1. Airflow rate (CFM or m³/h) 2. Filter efficiency (e.g., MERV rating) 3. Filter type (e.g., pleated, cartridge, or HEPA) 4. System pressure drop (Pa or in. w.g.) 5. Filter housing dimensions (if existing) Here's a simplified calculation: 1. Determine the airflow rate (Q) in CFM or m³/h. 2. Choose a filter efficiency (E) based on the desired MERV rating. 3. Select a filter type and its corresponding pressure drop (∆P) at the desired airflow rate. 4. Calculate the required filter face area (A) using: A = Q / (E x ∆P) where A is the filter face area in square feet (ft²) or square meters (m²). 1. Consider the filter housing dimensions (if existing) and adjust the filter size accordingly. Some general guidelines for filter sizes are: - Residential: 12-24 inches (305-610 mm) wide, 12-36 inches (305-914 mm) deep - Commercial: 24-48 i...