remove vowels in word with conditional

[perfringo]

I would split string to words and process word with function. For replacement I would use str.translate. Assuming that this is text in english:

import string

s = "Masonry - Concrete Block (Small) - Misc Air Layer - Insulation - Aluminium"
        
def process(word):
    mapping = str.maketrans(dict.fromkeys('aeiou', ''))
    length = 0
    for char in word:
        if char in string.ascii_letters:
            length += 1
            if 4 < length:
                return word.translate(mapping)
    else:    # no-break
        return word

print(' '.join(process(word) for word in s.split()))

# -> Msnry - Cncrt Blck (Smll) - Misc Air Lyr - Insltn - Almnm