What must all vents and caps be, according to regulations?

All vents and caps must be approved and installed according to manufacturers' recommendations to ensure safety, functionality, and compliance with building codes. This means that the materials used for the vents and caps, as well as their installation methods, should meet the standards set by the manufacturers, which are often in alignment with local plumbing codes and regulations. Proper installation according to these recommendations helps prevent issues such as backdrafting, pest intrusion, and allows for sufficient air circulation necessary for venting systems to operate effectively.

Being approved implies that the products have undergone testing and certification to meet the necessary safety and efficiency standards expected in plumbing systems. This is crucial for ensuring that plumbing systems operate without environmental hazards or health risks. Furthermore, adherence to these guidelines avoids potential code violations that could lead to fines or the need for costly retrofits. Thus, following manufacturers' recommendations for vents and caps is vital for the integrity of the plumbing system and the safety of occupants.