OpenBuildings™ Designer Help

Inline Device

Used to place inline devices in a route; include heater, cooler, humidifiers, dampers, silencers, filters, VAV etc.

Accessed from:


  • Ribbon: Building Systems Design > Mechanical > Mechanical Systems > Inline Device


Schema Properties example - Inline Devices

Selecting a fitting from the ribbon panel activates the Place Component settings dialog, where you can manage the schema parameters (DG instance properties). Also, the contextual Placement tab appears on the ribbon, that provides placement settings options for the currently selected fitting.

The generic placement settings, along with the unique set of dimensional and data parameters from the datagroup system provide the core workflow used to accurately position mechanical components within a system.

Component categories

These devices are adds on along a duct in the route in HVAC systems. Dampers control air volume by maintaining air flow in an HVAC system zone. Damper is easily placed at a route terminal or at branch end. The shortcuts RI and RS in AccuDraw places inline devices precisely. Based on the shape type, there are three Inline devices categories. They are rectangle, round and oval. The inline damper suits opposed blade device in a mixing duct. Setting the number of blades, their size and angles controls the air flow through a damper. Silencers reduces the noise level of flowing air in ducts and devices in a route.

Flat filters are the Inline devices composed of flat filter panel that deliver clean air through ducts to be used in heating, ventilation and air conditioning. Zigzag filters comprise zigzag pattern fibrous materials (zigzag pleated filter material housed in rectangular chamber.) filter the air and delivers cleans air through ducts to a room or space. The filtered and cleaned air is used in heating, ventilation and air conditioning It is also useful when hot air enters the heat exchanger, preventing dirt particles from obstructing the coil.

Coolers are the inline devices that cool air through the evaporation of water. Evaporative cooling differs from typical air conditioning systems which use vapor-compression or absorption refrigeration cycles. Evaporative cooling works by employing water's large enthalpy of vaporization. The temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor (evaporation), which can cool air using much less energy than refrigeration. In extremely dry climates, evaporative cooling of air has the added benefit of conditioning the air with more moisture for the comfort of building occupants. Unlike closed-cycle refrigeration, evaporative cooling requires a water source, and must continually consume water to operate.

Heaters are the inline devices that is designed to heat air before another process (for example, combustion in a boiler) with the primary objective of increasing the thermal efficiency of the process. They may be used alone or to replace a recuperative heat system or to replace a steam coil.

Inline air humidifiers increase humidity (moisture) in a room. The whole-house or furnace humidifiers, which connect to HVAC system to provide humidity to the entire house. Inline air humidifiers increase humidity (moisture) in a room. The whole-house or furnace humidifiers, which connect to HVAC system to provide humidity to the entire house.

These devices share most of the common properties.

Notable Properties

Connection End Type – The end conditions of ducts are set to flange, male or female connections with full dimensional control by setting the End Type property. Also, the two ends are independent, and may have different connections. For example, the value fl-2;fe-.13 creates a flange at End1 with size 2, and a female connection at End2 with a clearance of .13.

Damper dimensions – The damper related properties set in directly in the DG instance properties control damper size and type.

Notable Property Options

Auto Size – Opens the Auto Size Options dialog where the options allow to set the grille type, grille dimensions including the slots.

The list of devices available in Inline Device group is compiled in the Inline Device types topic.