Thermovent 1200 Sterile Heat and Exchanging Filter Lancets The outer diameter is 4"

The outer diameter is 4" and it is 1/32" thin

Zip closure with pouch

Special Nu-Form 7" support belt 2-5/8" center opening

Ideal for patient admission kits

Thermovent 1200 Sterile Heat and Exchanging Filter Lancets The outer diameter is 4"Smiths Medical ASD Inc Thermovent 1200 Sterile Heat and Exchanging Filter, Connections: 15 mm I. D. x 22 mm O. D. on patient end, 15mm O. D. on Circuit End, High efficiency HME paper elementsHigh efficiency HME paper elements. Recovers approximately 75% of the energy and moisture that would otherwise be lost through respiration. Low resistance to flow. Minimizes pressure build and reduces the work of breathing for weaning off the ventilator. Small