Door Articles

Usage Costs – The real price of your Industrial Q Door

What is the usage cost of an Industrial Q Door?


The cost of an industrial door encompasses more than just its initial purchase price. It also includes energy consumption, operational expenses, maintenance costs, transportation for servicing, repairs, and spare parts. Opting for the wrong type or low-quality door can lead to significant long-term expenses, impacting both finances and the environment.

To select the appropriate door for a specific location, it’s essential to consider these various costs associated with a door system. This is achieved by calculating the usage cost.

Direct and indirect costs

The usage cost comprises all expenses directly or indirectly influenced by the choice of door. These expenses include:

Direct Costs

Indirect Costs

Opting for the wrong type of door or compromising on quality can lead to a significant increase in indirect costs without a corresponding decrease in direct expenses. Maintenance, servicing, and repair costs are closely tied to the quality and sizing of the door.


Direct costs

Direct costs comprise:

Heat loss costs

Heat loss comprises three components:

Losses through transmission

Heat loss occurs as thermal energy moves through the material from the warmer to the colder side. The U-value quantifies the door’s resistance to heat transfer, representing its insulation capability. Typically, only the U-value of the most insulated area of the door panel is considered. However, for an accurate calculation of usage costs, the U-value of the entire door, including connections to the frame and floor, rubber seals, all edges, reinforcements, and any windows or pass doors, if present, must be taken into account.

Losses by air leakage

The amount of air that leaks through the door is influenced by the quality of the sealing system and the pressure difference between the inside and outside (due to ventilation and wind pressure). Ideally, minimal air should leak through a closed door. The corners where the door panels meet and the four corners of the door are particularly susceptible to air leakage.

The density value of the door (T-value) is determined in a laboratory setting. It’s crucial to assess how the sealing system will perform in real-world conditions over the long term. It’s advisable to examine various types of doors that have surpassed their warranty period to evaluate how well the sealing in the corners has endured usage. Selecting a robust sealing system is essential because replacing it can be costly and time-consuming. Pinching seals are preferred over sliding or trailing seals for their durability and effectiveness.

Air exchange losses

The extent of heat loss from an open door is typically much more significant than that from a closed door and is heavily influenced by whether the door is equipped with automatic controls or not.


Passage costs

Passage cost = number of passageways X passage time X time cost

To calculate the total passage cost, you must have information on the passage time and the total passage frequency for one year.

The passage time encompasses all factors contributing to the additional time required to pass through the gate. Passage time = Total time to pass through the door, minus the usual transportation time for the equivalent distance without the door.

Passage frequency measures transportation system disruptions. When calculating passage cost, factors like vehicle time, wages, and payroll expenses are factored in.

Passage frequency = number of passages in and out per hour converted into per year.


Indirect Costs

Indirect costs consist of:


Operating costs

The operating cost of the door’s drive unit is determined by its kilowatt consumption over a year. This cost typically varies only slightly among different door types and is usually negligible in normal cases. Generally, the annual operational cost is estimated at around £7.39. However, exceptions may arise for extremely heavy and high-frequency doors and gaps, such as overhead cranes, where energy consumption can be significantly higher and may require specific calculation.

Maintenance Costs

Maintenance & service costs encompass routine upkeep and maintenance tasks. Regular supervision and functional checks are required a few times a year, especially for electrically operated doors as per legal requirements. This includes inspecting and controlling functions according to user instructions, performing simpler tasks like cleaning, adjusting timings (e.g., for automatic closing), replacing fuses, lubricating, and noting/reporting any issues or parts needing replacement for the next service.

Product specification may change and it is advisable to consult with HAG technical advisors before specifying or ordering. HAG operates a policy of continuous improvement.

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