What are the structural differences between ceiling-mounted air-conditioning boxes and floor-standing horizontal units?

The ceiling-mounted air-conditioning box is designed with a load-bearing frame, hanging points and vibration reduction according to the suspension operation, while the floor-standing horizontal type relies on the base and foundation support. The appearance of the same horizontal layout does not mean that the floor-standing unit can be converted into a hoisting model by adding a few lifting lugs. The structural stress and maintenance methods need to be checked separately.

Where does the force path pass from the box to?

The weight of the ceiling-mounted unit is transmitted to the building structure through the hanging points and suspension frame. The box frame itself needs to be designed according to the suspension force. The weight of the floor-standing horizontal unit is transferred to the foundation or floor through the base. The base structure and foundation height must also be determined based on drainage conditions. The force paths are different, and so are the frame strengthening methods and connecting nodes.

The suspension frame must check the building load-bearing conditions and cannot rely on the box board for load-bearing; the base must check the flatness of the foundation and the compression amount of the shock absorber. Whether the loading and unloading lifting points and operating lifting points of the air-conditioning box can be mixed, please refer toCan the loading and unloading lifting points and operating lifting points of the air-conditioning box be mixed?。

Suspension points and bases serve different purposes

Ceiling-type units require long-term operation of hanging points or special supports and hangers. The location, quantity and rated load of the hanging points should be specified in the equipment drawings. The transport lifting lugs are only used for temporary lifting and cannot be directly used as long-term suspension points. Floor-standing horizontal units usually do not require long-term suspension, but the base needs to withstand operating weight, vibration and possible additional loads.

The boom and building connection points of the ceiling-mounted unit must be designed for long-term vibration, and the base height of the floor-standing unit must also consider the elevation of the drain outlet. How to determine the foundation height of horizontal air-conditioning boxes based on drainage conditions, please refer toHow to determine the foundation height of a horizontal air conditioning box based on drainage conditions?。

Vibration reduction methods vary with structural form

Ceiling-type units commonly use elastic hangers or shock absorbers to cut off structural vibration transmission, and the damping elements are installed between the boom and the building or between the boom and the box. Floor-standing horizontal units commonly use vibration-absorbing pads, spring dampers or independent foundations, and the vibration-absorbing elements are installed between the base and the foundation. The installation locations and maintenance methods of the two vibration reduction methods are different.

Structural vibration transmission is one of the noise propagation paths. Please refer toWhat noise propagation paths should we pay attention to when selecting an air-conditioning box? . If the vibration of the ceiling-mounted unit's support and hanger is not handled properly, it may be transmitted to distant rooms through the building structure.

The inspection space is limited by the installation location

The ceiling-mounted unit is installed in the ceiling, and the maintenance space is affected by the ceiling height, beam position and pipelines. Filter extraction, coil cleaning and fan replacement may need to be done from the side or bottom, with access openings located and sized to suit the building. Floor-standing horizontal units are usually accessed from the side or top, and the space is relatively controllable, but space still needs to be left for component extraction and door opening.

When the horizontal air-conditioning box is arranged against the wall, which side should be left for inspection? Please refer toWhen a horizontal air-conditioning box is arranged against a wall, which side should be left for inspection? . When there is insufficient space within the suspended ceiling, it may be necessary to evaluate component disassembly or adjust the installation location. For the arrangement of the filter section before and after the fan, please refer toWhat needs to be considered when arranging the filter section before and after the fan?。

Drainage elevation and interface direction are different

The water tray and drainage pipe of the ceiling-mounted unit are limited by the height inside the ceiling, and the water seal, slope and discharge point need to be checked in advance. Drainage in the negative pressure section also requires a water seal structure, and the space inside the suspended ceiling may be tighter. It is easier to use gravity for drainage of floor-standing units, but if the foundation is too low or too high, it will affect the water seal and the slope of the outer pipe.

How to combine the slope of the water pan of the air-conditioning box with the layout of the drain outlet, please refer toHow to combine the slope of the water pan of the air-conditioning box with the layout of the drain outlet? . Why water sealing is often needed for negative pressure drainage of air conditioning boxes? Please refer toWhy does negative pressure drainage of air conditioning boxes often require water sealing?。

Modification requires re-confirming the structure and function

When the floor-standing horizontal type is to be changed to a suspended ceiling type, the support, center of gravity, fixation and maintenance conditions need to be re-confirmed. The equipment manufacturer provides structural and weight information, and construction and installation related professionals confirm the support plan. Transport lifting eyes must not be used as a substitute for unconfirmed long-term operating lifting points. Changing the suspended ceiling to floor also requires checking the base, foundation and drainage.

What unchangeable conditions should be determined first for non-standard customization of air-conditioning boxes, please refer toWhat unchangeable conditions should be determined first for non-standard customization of air-conditioning boxes? . Horizontal and vertical types require different space, please refer toWhat kind of space do horizontal air-conditioning boxes and vertical air-conditioning boxes require?。

Aili industrial supporting equipment

Aili Industrial can evaluate the sheet metal and complete machine structure according to the installation method, first clarify the on-site load-bearing and maintenance boundaries, and then confirm the feasible hoisting or landing plan. Aili's industrial manufacturing end covers independent research and development and production of motors and fans, control systems, sheet metal, air filters and complete machine assembly. Ceiling-type and floor-type frame structures, hanging point positions and base forms can be matched in the same set of packages; non-standard structures can be adjusted according to on-site hoisting and basic conditions.

Product form can be viewedAir handling unit andFan box page; clean air supply package can be combinedFFU fan filter unit andEFU equipment end fan filter unit verification; terminal particle filtration can be combinedHEPA/ULPA filter confirmation; when it comes to gaseous pollution control, you can communicate separatelyChemical filter solutions. The specific structural plan, load-bearing conditions and delivery scope still need to be verified based on the corresponding configuration data and on-site working conditions. Actual results are subject to on-site installation inspection and performance test results.

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Related questions and answers

Can a floor-standing horizontal unit be converted into a ceiling-mounted unit by adding lifting lugs?
cannot. The ceiling-mounted unit needs to redesign the load-bearing frame and lifting points according to the suspension operation. The base and frame of the floor-standing unit are not necessarily suitable for suspension stress.

How to determine the inspection space for ceiling-mounted units?
It needs to be checked in conjunction with the ceiling height, beam position, pipelines, access door locations and component extraction paths. You cannot just look at the overall dimensions of the unit.

Can Aili Industrial help evaluate ceiling-mounted and floor-standing solutions?
The structural plan can be evaluated based on the on-site load-bearing, hoisting conditions and maintenance requirements. The specific configuration needs to be confirmed based on the project conditions.

Related articles

1. Can the loading and unloading lifting points and operating lifting points of the air-conditioning box be mixed?

2. How to determine the foundation height of a horizontal air conditioning box based on drainage conditions?

3. What kind of space do horizontal air-conditioning boxes and vertical air-conditioning boxes require?

4. What noise propagation paths should we pay attention to when selecting an air-conditioning box?

Key points for selection and acceptance inspection