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FIG 354, 354T

Updraft Vent

Atmospheric updraft vents are installed on the top of storage tank vent pipes on underground and aboveground fuel storage tanks.

Note: Open vents will allow unrestricted evaporation of product.

WARNING: DO NOT FILL OR UNLOAD FUEL FROM A STORAGE TANK UNLESS IT IS CERTAIN THAT THE TANK VENTS WILL OPERATE PROPERLY. Morrison tank vents are designed only for use on shop fabricated atmospheric tanks which have been built and tested in accordance with UL 142, NFPA 30 & 30A, and API 650 and in accordance with all applicable local, state, and federal laws. In normal operation, dust and debris can accumulate in vent openings and block air passages. Certain atmospheric conditions such as a sudden drop in temperature, below freezing temperatures, and freezing rain can cause moisture to enter the vent and freeze which can restrict internal movement of vent mechanisms and block air passages. All storage tank vent air passages must be completely free of restriction and all vent mechanisms must have free movement in order to insure proper operation. Any restriction of airflow can cause excessive pressure or vacuum to build up in the storage tank, which can result in structural damage to the tank, fuel spillage, property damage, fire, injury, and death. Monthly inspection, and immediate inspection during freezing conditions, by someone familiar with the proper operation of storage tank vents, is required to insure venting devices are functioning properly before filling or unloading a tank.

Product Features

Standard Features

Directs vapors outward and upward in accordance with NFPA 30

Protects the vent line from debris and insects

Water resistant rain cap sheds water away from the vent line

Slip on design with set screws for easy installation

Internal drain channels water penetration out through weep hole

354T is compatible with DEF

Construction Details


  • Body and cap: Aluminum die cast
  • Screen: 40 mesh stainless steel


  • Body and cap: PTFE coated black aluminum
  • Screen: 40 mesh stainless steel

Certifications & Listings


CARB 89-12 (1 1/2″ and 2″ models)

Product Ordering Instructions

Fig Suffix Size Description Weight
354 0100 AV 1.5” Updraft Vent 0.75
354 0200 AV 2” Updraft Vent 0.75
354 0300 AV 3” Updraft Vent 1.5
354 0400 AV 4” Updraft Vent 2.25
354T 0200 AV 2” Updraft Vent, Slip-on, PTFE Coated Aluminum, w/SS Screen 0.75
354T 0300AV 3” Updraft Vent, Slip-on, PTFE Coated Aluminum, w/SS Screen 1.5