Webber EMI manufactures evaporative emissions testing systems in a variety of sizes.  We provide Micro and Mini-SHEDs suitable for component permeation testing and small engines, to  Vehicle SHEDs capable of testing Medium Duty Trucks. Starting with one of our standard configurations, an evaporative emissions testing system can be custom-built to our customer specifications regarding size, window placement, access door type, and other performance or testing needs. All Webber EMI SHEDs incorporate a modular-systems design that allows the basic Fixed Volume / Fixed Temperature (FV/FT) enclosure to be upgraded to full Variable Volume / Variable Temperature (VV/VT) enclosure — even years later — on-site, and after installation.

Evaporative Emissions Testing System

FV/FT Vehicle SHED

The Webber EMI Model 101 Vehicle SHED has been an industry standard for decades. It incorporates an entry-level Fixed-Volume / Fixed-Temperature (FV/FT) test system design that, even years later, can be upgraded into a full Variable-Volume / Variable-Temperature (VV/VT) SHED evaporative emissions testing system. It is available in several standard sizes suitable for testing complete vehicles, motorcycles, small tractors, off-road vehicles, lawn mowers, small machines and hand-held equipment.

VV/VT Vehicle SHED

The Webber EMI Model 101 Vehicle SHED is also available as a Variable Volume / Variable Temperature (VV/VT) SHED. This SHED is designed to support a full range of test protocols and temperature profiles.  Using the Webber EMI movable roof system, absolute SHED volume is automatically controlled to maintain zero-differential pressure between the SHED interior and ambient laboratory conditions. It is designed for testing large equipment such as cars, trucks, tractors and other large machinery.


The Webber EMI Model 102 Mini- SHED is designed to facilitate testing applications which require a medium sized enclosure with the ability to resolve a very low emission concentration. This test system incorporates all of the features associated with our ‘full vehicle’ SHED systems, but the enclosure has been re-sized to a smaller footprint. This helps to improve emission detections and is suitable for testing small equipment such as ATV’s, lawn mowers, and other objects equivalent in size.

Micro SHED

The Webber EMI Model 102-Micro SHED test system is designed specifically for Ultra-Low (ULEV) and Zero (ZEV) Emission level evaporative testing. While incorporating most of the features associated with our full vehicle SHED systems, the Micro-SHED test system has been resized to facilitate automated evaporative testing of smaller complete utility products, sub-systems and discrete components such as fuel tanks, valves, hoses, and canisters.

Running Loss SHED

The Webber EMI Running Loss SHED is a modified version of our full-sized Vehicle SHED. This extra long SHED, equipped with special air handling equipment, a proportional speed fan, vehicle combustion makeup air, and an auxiliary personnel door, is combined with a centrally located dynamometer to accept both front- and rear-wheel drive vehicles. In addition to full exhaust emissions testing capability, this SHED supports all applicable diurnal evaporative emissions test protocols.

On-Board Refueling & Vapor Recovery

Webber EMI can provide On-Board Refueling / Vapor Recovery (OR/VR) capability to any of our SHEDs, either new or existing with on-site installation. Locations, height and amount of ports can be placed in a variety of places to best suit the end user. Using several different methods, vehicles or other fuel-dependent machines can be re-fueled while the SHED is sealed.

Bleed Emission Sample and Test Equipment

Webber EMI has developed a system for the capture of extremely small amounts of hydrocarbon emissions.  This system will collect, prepare and analyze the contents of a sample bag.  Call us for more information regarding your preferred bleed emissions collection method.

SHED System Specifications

Micro SHED (10-200 cu ft)Mini SHED (250-1000 cu ft)Vehicle SHED (1100-5300 cu ft)
Standard Volume 142 cu ft (4.0 cu meters)328 cu ft (9.3 cu meters)

Custom Sizes Available

1157 cu ft (32.8 cu-m); 1661 cu ft (47 cu-m)
5280 cu ft (149.5 cu-m) Medium Duty.
Custom Sizes available
ID (W x H x L)46″ x 72″ x 73.5″ (1.18m x 1.83m x 1.86m).328 cu ft SHED – 73″ x 72″ H x 108″ L (1.85m x 1.82m x 2.74m)1661 cu ft SHED – 119.5″ x 94″ x 255″ (3.0m x 2.4m x 6.5m)
Temperature Operating Range65 deg F to 105 deg F (18 C to 41 C)65 deg F to 105 deg F (18 C to 41 C)65 deg F to 105 deg F (18 C to 41 C)
Extended Temperature Range
50 deg F to 140 deg F (10 C to 60 C)50 deg F to 140 deg F (10 C to 60 C)50 deg F to 140 deg F (10 C to 60 C)
Heat & Cool UnitSelf ContainedSelf ContainedSelf Contained
Vehicle DoorSide HingedSide HingedTop Hinged California Door;

Optional Guillotine style is available.

Purge System Poppet valve and blower assemblyPoppet valve and blower assemblyPoppet valve and blower assembly
Volume CompensationMovable Roof (sizes greater than 140 Cu-ft) Or Mass Flow BalanceMovable Roof; Mass Flow BalanceMovable Roof; Mass Flow Balance
Personnel DoorN/AN/AOptional Feature
Fuel Tank Temperature Management System (FTTMS)1 outlet provided as Standard (2kW)Up to 3 outlets (2kW per outlet)Up to 3 outlets (2kW per outlet)
Auxilliary Outlets (20 amps / outlet)1Up to 2Up to 2
OnBoard Refueling Vapor Recovery (OR/VR)Window Option available on 140 Cu-ft models and larger (Boot or Quick Connect Style)Window Option Available (Boot or Quick Connect Style)Window Option Available (Boot or Quick Connect Style)