VESDA-E VSP-965 Smoke Sampling Module where the air is continually drawn from the protected area through the air sampling pipe network and into the detector by a high-efficiency aspirator. The air sampling pipe network can contain up to four pipes. The air from each sampling pipe passes through an airflow sensor and then a sample of the air is drawn into the smoke detection chamber via the sampling module, after first passing through the filter. An additional filter provides clean air to protect the optical surfaces inside the detection chamber from contamination.