The scoping section 227.3 states that at least one of each type of sales and service counter must comply with ADA 904.4. This type of counter may have either a parallel approach or a forward approach. Section 904.4 requires that the sales or service counter be no higher than 36" a.f.f.. The length will depend on the approach.
Service counters are one's like an information desk or a reception desk where only information is exchanged.

This reception desk has provides a portion of the counter that is provides a forward approach with a knee space as well as the 36" maximum height and 36" min length at the accessible portion.
This reception desk is higher than 36" a.f.f.
A sales counter where the exchange of money for goods or services takes place will be required to comply with 904.4. Some examples are sales counters at retail stores, or check-out aisles at a doctor's office.
This sales counter was much higher than 36" a.f.f.
Both sales and service counters must be no higher than 36" and depending on whether it is a forward approach or a parallel approach there will be different requirements for the length. The length for a counter with a parallel approach will be 36" long.
Although this counter is 36" high, the length was not 36" long
If a forward approach is provided, the counter must be at least 30" wide and no higher than 36" a.f.f. A knee and toe clearance must also be provided if it is positioned for a forward approach.

This information counter has a forward approach with a knee space and proper height.
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