121 x 235mm Window ENV952.403

Twofold envelopes are compatible with all Twofold Folder Inserters and Franking Machines, to help reduce downtime associated with incompatible envelopes.

Our envelopes are ‘CheckSecure’ – with our unique printed opaque to prevent fraud for your mail containing financial or sensitive documents.

All envelope prices are per 1,000, enquire for the most competitive price and options for storage and call-off service.


These vertical window envelopes are often used for internal mail, and statements. If you have any questions about the best envelope for your organisation, please ask.

We offer a wide selection of machine compatible, bespoke and self-seal envelopes in a range of sizes, window sizes and positions. You can take advantage of our FREE storage for up to 12 months, allowing you to make savings on larger orders and schedule call off when you need them through the year.

We deliver almost everywhere in the UK and in most cases can deliver next day if ordered before 1.30pm.

Additional information



Envelope Size

121mm x 235mm

Window Size

90mm x 45mm

Window Position

15mm up, 136mm from left hand side

Horizontal / Vertical Window




Outside Seams



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